diff --git a/hal/src/main/native/include/hal/DriverStation.h b/hal/src/main/native/include/hal/DriverStation.h
index 63a904086f..23595db875 100644
--- a/hal/src/main/native/include/hal/DriverStation.h
+++ b/hal/src/main/native/include/hal/DriverStation.h
@@ -177,7 +177,7 @@ int32_t HAL_SetJoystickOutputs(int32_t joystickNum, int64_t outputs,
  * Warning: This is not an official time (so it cannot be used to dispute ref
  * calls or guarantee that a function will trigger before the match ends).
  *
- * The Practice Match function of the DS approximates the behaviour seen on
+ * The Practice Match function of the DS approximates the behavior seen on
  * the field.
  *
  * @param status the error code, or 0 for success
diff --git a/hal/src/main/native/include/hal/PWM.h b/hal/src/main/native/include/hal/PWM.h
index 781a423667..7267823855 100644
--- a/hal/src/main/native/include/hal/PWM.h
+++ b/hal/src/main/native/include/hal/PWM.h
@@ -1,5 +1,5 @@
 /*----------------------------------------------------------------------------*/
-/* Copyright (c) 2016-2018 FIRST. All Rights Reserved.                        */
+/* Copyright (c) 2016-2020 FIRST. All Rights Reserved.                        */
 /* Open Source Software - may be modified and shared by FRC teams. The code   */
 /* must be accompanied by the FIRST BSD license file in the root directory of */
 /* the project.                                                               */
@@ -158,7 +158,7 @@ void HAL_SetPWMPosition(HAL_DigitalHandle pwmPortHandle, double position,
  * Sets a PWM channel to be disabled.
  *
  * The channel is disabled until the next time it is set. Note this is different
- * from just setting a 0 speed, as this will actively stop all signalling on the
+ * from just setting a 0 speed, as this will actively stop all signaling on the
  * channel.
  *
  * @param pwmPortHandle the PWM handle.
diff --git a/ntcore/src/main/native/cpp/CallbackManager.h b/ntcore/src/main/native/cpp/CallbackManager.h
index 2d9b11dbb8..bf9b00082e 100644
--- a/ntcore/src/main/native/cpp/CallbackManager.h
+++ b/ntcore/src/main/native/cpp/CallbackManager.h
@@ -1,5 +1,5 @@
 /*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2019 FIRST. All Rights Reserved.                        */
+/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
 /* Open Source Software - may be modified and shared by FRC teams. The code   */
 /* must be accompanied by the FIRST BSD license file in the root directory of */
 /* the project.                                                               */
@@ -83,7 +83,7 @@ class CallbackThread : public wpi::SafeThread {
     wpi::mutex poll_mutex;
     wpi::condition_variable poll_cond;
     bool terminating = false;
-    bool cancelling = false;
+    bool canceling = false;
   };
   wpi::UidVector<std::shared_ptr<Poller>, 64> m_pollers;
 
@@ -247,10 +247,10 @@ class CallbackManager {
     *timed_out = false;
     while (poller->poll_queue.empty()) {
       if (poller->terminating) return infos;
-      if (poller->cancelling) {
+      if (poller->canceling) {
         // Note: this only works if there's a single thread calling this
         // function for any particular poller, but that's the intended use.
-        poller->cancelling = false;
+        poller->canceling = false;
         return infos;
       }
       if (timeout == 0) {
@@ -287,7 +287,7 @@ class CallbackManager {
 
     {
       std::scoped_lock lock(poller->poll_mutex);
-      poller->cancelling = true;
+      poller->canceling = true;
     }
     poller->poll_cond.notify_one();
   }
diff --git a/wpilibNewCommands/src/main/native/include/frc2/command/button/Button.h b/wpilibNewCommands/src/main/native/include/frc2/command/button/Button.h
index af861d442a..5e01edf5dd 100644
--- a/wpilibNewCommands/src/main/native/include/frc2/command/button/Button.h
+++ b/wpilibNewCommands/src/main/native/include/frc2/command/button/Button.h
@@ -86,7 +86,7 @@ class Button : public Trigger {
 
   /**
    * Binds a command to be started repeatedly while the button is pressed, and
-   * cancelled when it is released.  Takes a raw pointer, and so is non-owning;
+   * canceled when it is released.  Takes a raw pointer, and so is non-owning;
    * users are responsible for the lifespan of the command.
    *
    * @param command The command to bind.
@@ -97,7 +97,7 @@ class Button : public Trigger {
 
   /**
    * Binds a command to be started repeatedly while the button is pressed, and
-   * cancelled when it is released.  Transfers command ownership to the button
+   * canceled when it is released.  Transfers command ownership to the button
    * scheduler, so the user does not have to worry about lifespan - rvalue refs
    * will be *moved*, lvalue refs will be *copied.*
    *
@@ -131,7 +131,7 @@ class Button : public Trigger {
                    wpi::ArrayRef<Subsystem*> requirements = {});
 
   /**
-   * Binds a command to be started when the button is pressed, and cancelled
+   * Binds a command to be started when the button is pressed, and canceled
    * when it is released.  Takes a raw pointer, and so is non-owning; users are
    * responsible for the lifespan of the command.
    *
@@ -142,7 +142,7 @@ class Button : public Trigger {
   Button WhenHeld(Command* command, bool interruptible = true);
 
   /**
-   * Binds a command to be started when the button is pressed, and cancelled
+   * Binds a command to be started when the button is pressed, and canceled
    * when it is released.  Transfers command ownership to the button scheduler,
    * so the user does not have to worry about lifespan - rvalue refs will be
    * *moved*, lvalue refs will be *copied.*
@@ -205,7 +205,7 @@ class Button : public Trigger {
                       wpi::ArrayRef<Subsystem*> requirements = {});
 
   /**
-   * Binds a command to start when the button is pressed, and be cancelled when
+   * Binds a command to start when the button is pressed, and be canceled when
    * it is pressed again.  Takes a raw pointer, and so is non-owning; users are
    * responsible for the lifespan of the command.
    *
@@ -216,7 +216,7 @@ class Button : public Trigger {
   Button ToggleWhenPressed(Command* command, bool interruptible = true);
 
   /**
-   * Binds a command to start when the button is pressed, and be cancelled when
+   * Binds a command to start when the button is pressed, and be canceled when
    * it is pessed again.  Transfers command ownership to the button scheduler,
    * so the user does not have to worry about lifespan - rvalue refs will be
    * *moved*, lvalue refs will be *copied.*
@@ -233,7 +233,7 @@ class Button : public Trigger {
   }
 
   /**
-   * Binds a command to be cancelled when the button is pressed.  Takes a
+   * Binds a command to be canceled when the button is pressed.  Takes a
    * raw pointer, and so is non-owning; users are responsible for the lifespan
    *  and scheduling of the command.
    *
diff --git a/wpilibNewCommands/src/main/native/include/frc2/command/button/Trigger.h b/wpilibNewCommands/src/main/native/include/frc2/command/button/Trigger.h
index a40779f5a1..ecfc4d1592 100644
--- a/wpilibNewCommands/src/main/native/include/frc2/command/button/Trigger.h
+++ b/wpilibNewCommands/src/main/native/include/frc2/command/button/Trigger.h
@@ -108,7 +108,7 @@ class Trigger {
 
   /**
    * Binds a command to be started repeatedly while the trigger is active, and
-   * cancelled when it becomes inactive.  Takes a raw pointer, and so is
+   * canceled when it becomes inactive.  Takes a raw pointer, and so is
    * non-owning; users are responsible for the lifespan of the command.
    *
    * @param command The command to bind.
@@ -119,7 +119,7 @@ class Trigger {
 
   /**
    * Binds a command to be started repeatedly while the trigger is active, and
-   * cancelled when it becomes inactive.  Transfers command ownership to the
+   * canceled when it becomes inactive.  Transfers command ownership to the
    * button scheduler, so the user does not have to worry about lifespan -
    * rvalue refs will be *moved*, lvalue refs will be *copied.*
    *
@@ -168,7 +168,7 @@ class Trigger {
 
   /**
    * Binds a command to be started when the trigger becomes active, and
-   * cancelled when it becomes inactive.  Takes a raw pointer, and so is
+   * canceled when it becomes inactive.  Takes a raw pointer, and so is
    * non-owning; users are responsible for the lifespan of the command.
    *
    * @param command The command to bind.
@@ -179,7 +179,7 @@ class Trigger {
 
   /**
    * Binds a command to be started when the trigger becomes active, and
-   * cancelled when it becomes inactive.  Transfers command ownership to the
+   * canceled when it becomes inactive.  Transfers command ownership to the
    * button scheduler, so the user does not have to worry about lifespan -
    * rvalue refs will be *moved*, lvalue refs will be *copied.*
    *
@@ -267,7 +267,7 @@ class Trigger {
                        wpi::ArrayRef<Subsystem*> requirements = {});
 
   /**
-   * Binds a command to start when the trigger becomes active, and be cancelled
+   * Binds a command to start when the trigger becomes active, and be canceled
    * when it again becomes active.  Takes a raw pointer, and so is non-owning;
    * users are responsible for the lifespan of the command.
    *
@@ -278,7 +278,7 @@ class Trigger {
   Trigger ToggleWhenActive(Command* command, bool interruptible = true);
 
   /**
-   * Binds a command to start when the trigger becomes active, and be cancelled
+   * Binds a command to start when the trigger becomes active, and be canceled
    * when it again becomes active.  Transfers command ownership to the button
    * scheduler, so the user does not have to worry about lifespan - rvalue refs
    * will be *moved*, lvalue refs will be *copied.*
@@ -311,7 +311,7 @@ class Trigger {
   }
 
   /**
-   * Binds a command to be cancelled when the trigger becomes active.  Takes a
+   * Binds a command to be canceled when the trigger becomes active.  Takes a
    * raw pointer, and so is non-owning; users are responsible for the lifespan
    *  and scheduling of the command.
    *
diff --git a/wpilibOldCommands/src/main/java/edu/wpi/first/wpilibj/command/Command.java b/wpilibOldCommands/src/main/java/edu/wpi/first/wpilibj/command/Command.java
index da135ca7a3..76a1618b06 100644
--- a/wpilibOldCommands/src/main/java/edu/wpi/first/wpilibj/command/Command.java
+++ b/wpilibOldCommands/src/main/java/edu/wpi/first/wpilibj/command/Command.java
@@ -1,5 +1,5 @@
 /*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
+/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
 /* Open Source Software - may be modified and shared by FRC teams. The code   */
 /* must be accompanied by the FIRST BSD license file in the root directory of */
 /* the project.                                                               */
@@ -330,7 +330,7 @@ public abstract class Command implements Sendable, AutoCloseable {
    * method for time-sensitive commands.
    *
    * <p>Returning false will result in the command never ending automatically. It may still be
-   * cancelled manually or interrupted by another command. Returning true will result in the
+   * canceled manually or interrupted by another command. Returning true will result in the
    * command executing once and finishing immediately. We recommend using {@link InstantCommand}
    * for this.
    *
@@ -447,7 +447,7 @@ public abstract class Command implements Sendable, AutoCloseable {
 
   /**
    * Clears list of subsystem requirements. This is only used by
-   * {@link ConditionalCommand} so cancelling the chosen command works properly
+   * {@link ConditionalCommand} so canceling the chosen command works properly
    * in {@link CommandGroup}.
    */
   protected void clearRequirements() {
diff --git a/wpilibOldCommands/src/main/java/edu/wpi/first/wpilibj/command/ConditionalCommand.java b/wpilibOldCommands/src/main/java/edu/wpi/first/wpilibj/command/ConditionalCommand.java
index 2dc6f66c15..01d316e8ba 100644
--- a/wpilibOldCommands/src/main/java/edu/wpi/first/wpilibj/command/ConditionalCommand.java
+++ b/wpilibOldCommands/src/main/java/edu/wpi/first/wpilibj/command/ConditionalCommand.java
@@ -1,5 +1,5 @@
 /*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2019 FIRST. All Rights Reserved.                        */
+/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
 /* Open Source Software - may be modified and shared by FRC teams. The code   */
 /* must be accompanied by the FIRST BSD license file in the root directory of */
 /* the project.                                                               */
@@ -141,7 +141,7 @@ public abstract class ConditionalCommand extends Command {
 
     if (m_chosenCommand != null) {
       /*
-       * This is a hack to make cancelling the chosen command inside a
+       * This is a hack to make canceling the chosen command inside a
        * CommandGroup work properly
        */
       m_chosenCommand.clearRequirements();
diff --git a/wpilibOldCommands/src/main/native/cpp/commands/CommandGroup.cpp b/wpilibOldCommands/src/main/native/cpp/commands/CommandGroup.cpp
index f64ba67b6b..31354e38d7 100644
--- a/wpilibOldCommands/src/main/native/cpp/commands/CommandGroup.cpp
+++ b/wpilibOldCommands/src/main/native/cpp/commands/CommandGroup.cpp
@@ -1,5 +1,5 @@
 /*----------------------------------------------------------------------------*/
-/* Copyright (c) 2011-2019 FIRST. All Rights Reserved.                        */
+/* Copyright (c) 2011-2020 FIRST. All Rights Reserved.                        */
 /* Open Source Software - may be modified and shared by FRC teams. The code   */
 /* must be accompanied by the FIRST BSD license file in the root directory of */
 /* the project.                                                               */
@@ -137,7 +137,7 @@ void CommandGroup::_Execute() {
       // If command timed out, cancel it so it's removed from the Scheduler
       if (entry->IsTimedOut()) cmd->_Cancel();
 
-      // If command finished or was cancelled, remove it from Scheduler
+      // If command finished or was canceled, remove it from Scheduler
       if (cmd->Run()) {
         break;
       } else {
@@ -192,7 +192,7 @@ void CommandGroup::_Execute() {
       child->_Cancel();
     }
 
-    // If child finished or was cancelled, set it to nullptr. nullptr entries
+    // If child finished or was canceled, set it to nullptr. nullptr entries
     // are removed later.
     if (!child->Run()) {
       child->Removed();
diff --git a/wpilibOldCommands/src/main/native/cpp/commands/ConditionalCommand.cpp b/wpilibOldCommands/src/main/native/cpp/commands/ConditionalCommand.cpp
index 1c75c65f8c..3d89d92f04 100644
--- a/wpilibOldCommands/src/main/native/cpp/commands/ConditionalCommand.cpp
+++ b/wpilibOldCommands/src/main/native/cpp/commands/ConditionalCommand.cpp
@@ -1,5 +1,5 @@
 /*----------------------------------------------------------------------------*/
-/* Copyright (c) 2017-2019 FIRST. All Rights Reserved.                        */
+/* Copyright (c) 2017-2020 FIRST. All Rights Reserved.                        */
 /* Open Source Software - may be modified and shared by FRC teams. The code   */
 /* must be accompanied by the FIRST BSD license file in the root directory of */
 /* the project.                                                               */
@@ -46,7 +46,7 @@ void ConditionalCommand::_Initialize() {
   }
 
   if (m_chosenCommand != nullptr) {
-    // This is a hack to make cancelling the chosen command inside a
+    // This is a hack to make canceling the chosen command inside a
     // CommandGroup work properly
     m_chosenCommand->ClearRequirements();
 
diff --git a/wpilibOldCommands/src/main/native/cpp/commands/Scheduler.cpp b/wpilibOldCommands/src/main/native/cpp/commands/Scheduler.cpp
index 931624cda9..47212e5501 100644
--- a/wpilibOldCommands/src/main/native/cpp/commands/Scheduler.cpp
+++ b/wpilibOldCommands/src/main/native/cpp/commands/Scheduler.cpp
@@ -171,8 +171,8 @@ void Scheduler::InitSendable(SendableBuilder& builder) {
     // Cancel commands whose cancel buttons were pressed on the SmartDashboard
     if (!toCancel.empty()) {
       for (auto& command : m_impl->commands) {
-        for (const auto& cancelled : toCancel) {
-          if (command->GetID() == cancelled) {
+        for (const auto& canceled : toCancel) {
+          if (command->GetID() == canceled) {
             command->Cancel();
           }
         }
diff --git a/wpilibOldCommands/src/main/native/include/frc/commands/Command.h b/wpilibOldCommands/src/main/native/include/frc/commands/Command.h
index 241490a9e2..cc6b7950f2 100644
--- a/wpilibOldCommands/src/main/native/include/frc/commands/Command.h
+++ b/wpilibOldCommands/src/main/native/include/frc/commands/Command.h
@@ -1,5 +1,5 @@
 /*----------------------------------------------------------------------------*/
-/* Copyright (c) 2011-2019 FIRST. All Rights Reserved.                        */
+/* Copyright (c) 2011-2020 FIRST. All Rights Reserved.                        */
 /* Open Source Software - may be modified and shared by FRC teams. The code   */
 /* must be accompanied by the FIRST BSD license file in the root directory of */
 /* the project.                                                               */
@@ -318,7 +318,7 @@ class Command : public ErrorBase,
   /**
    * Clears list of subsystem requirements.
    *
-   * This is only used by ConditionalCommand so cancelling the chosen command
+   * This is only used by ConditionalCommand so canceling the chosen command
    * works properly in CommandGroup.
    */
   void ClearRequirements();
@@ -344,7 +344,7 @@ class Command : public ErrorBase,
    * time-sensitive commands.
    *
    * Returning false will result in the command never ending automatically.
-   * It may still be cancelled manually or interrupted by another command.
+   * It may still be canceled manually or interrupted by another command.
    * Returning true will result in the command executing once and finishing
    * immediately. We recommend using InstantCommand for this.
    *
diff --git a/wpilibc/src/main/native/include/frc/DriverStation.h b/wpilibc/src/main/native/include/frc/DriverStation.h
index 381844266b..b0c9208945 100644
--- a/wpilibc/src/main/native/include/frc/DriverStation.h
+++ b/wpilibc/src/main/native/include/frc/DriverStation.h
@@ -368,7 +368,7 @@ class DriverStation : public ErrorBase {
    * Warning: This is not an official time (so it cannot be used to dispute ref
    * calls or guarantee that a function will trigger before the match ends).
    *
-   * The Practice Match function of the DS approximates the behaviour seen on
+   * The Practice Match function of the DS approximates the behavior seen on
    * the field.
    *
    * @return Time remaining in current match period (auto or teleop)
diff --git a/wpilibc/src/main/native/include/frc/IterativeRobot.h b/wpilibc/src/main/native/include/frc/IterativeRobot.h
index 13861e85ce..24fdba3aa1 100644
--- a/wpilibc/src/main/native/include/frc/IterativeRobot.h
+++ b/wpilibc/src/main/native/include/frc/IterativeRobot.h
@@ -36,7 +36,7 @@ class IterativeRobot : public IterativeRobotBase {
   /**
    * Provide an alternate "main loop" via StartCompetition().
    *
-   * This specific StartCompetition() implements "main loop" behaviour synced
+   * This specific StartCompetition() implements "main loop" behavior synced
    * with the DS packets.
    */
   void StartCompetition() override;
diff --git a/wpilibj/src/main/java/edu/wpi/first/wpilibj/DriverStation.java b/wpilibj/src/main/java/edu/wpi/first/wpilibj/DriverStation.java
index a20f0a52ca..bd8a44bab3 100644
--- a/wpilibj/src/main/java/edu/wpi/first/wpilibj/DriverStation.java
+++ b/wpilibj/src/main/java/edu/wpi/first/wpilibj/DriverStation.java
@@ -936,7 +936,7 @@ public class DriverStation {
    * but does send an approximate match time. The value will count down the time remaining in the
    * current period (auto or teleop). Warning: This is not an official time (so it cannot be used to
    * dispute ref calls or guarantee that a function will trigger before the match ends) The
-   * Practice Match function of the DS approximates the behaviour seen on the field.
+   * Practice Match function of the DS approximates the behavior seen on the field.
    *
    * @return Time remaining in current match period (auto or teleop) in seconds
    */
diff --git a/wpilibj/src/main/java/edu/wpi/first/wpilibj/Timer.java b/wpilibj/src/main/java/edu/wpi/first/wpilibj/Timer.java
index 43b40cfcb8..5d71e721da 100644
--- a/wpilibj/src/main/java/edu/wpi/first/wpilibj/Timer.java
+++ b/wpilibj/src/main/java/edu/wpi/first/wpilibj/Timer.java
@@ -24,7 +24,7 @@ public class Timer {
    * but does send an approximate match time. The value will count down the time remaining in the
    * current period (auto or teleop). Warning: This is not an official time (so it cannot be used to
    * dispute ref calls or guarantee that a function will trigger before the match ends) The
-   * Practice Match function of the DS approximates the behaviour seen on the field.
+   * Practice Match function of the DS approximates the behavior seen on the field.
    *
    * @return Time remaining in current match period (auto or teleop) in seconds
    */
diff --git a/wpilibj/src/main/java/edu/wpi/first/wpilibj/Victor.java b/wpilibj/src/main/java/edu/wpi/first/wpilibj/Victor.java
index 2d1924092d..29c1b27846 100644
--- a/wpilibj/src/main/java/edu/wpi/first/wpilibj/Victor.java
+++ b/wpilibj/src/main/java/edu/wpi/first/wpilibj/Victor.java
@@ -1,5 +1,5 @@
 /*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
+/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
 /* Open Source Software - may be modified and shared by FRC teams. The code   */
 /* must be accompanied by the FIRST BSD license file in the root directory of */
 /* the project.                                                               */
@@ -17,7 +17,7 @@ import edu.wpi.first.wpilibj.smartdashboard.SendableRegistry;
  *
  * <p>Note that the Victor uses the following bounds for PWM values. These values were determined
  * empirically and optimized for the Victor 888. These values should work reasonably well for
- * Victor 884 controllers also but if users experience issues such as asymmetric behaviour around
+ * Victor 884 controllers also but if users experience issues such as asymmetric behavior around
  * the deadband or inability to saturate the controller in either direction, calibration is
  * recommended. The calibration procedure can be found in the Victor 884 User Manual available
  * from VEX Robotics: http://content.vexrobotics.com/docs/ifi-v884-users-manual-9-25-06.pdf
diff --git a/wpilibj/src/main/java/edu/wpi/first/wpilibj/shuffleboard/BuiltInWidgets.java b/wpilibj/src/main/java/edu/wpi/first/wpilibj/shuffleboard/BuiltInWidgets.java
index b9a1939ede..fa98a0e143 100644
--- a/wpilibj/src/main/java/edu/wpi/first/wpilibj/shuffleboard/BuiltInWidgets.java
+++ b/wpilibj/src/main/java/edu/wpi/first/wpilibj/shuffleboard/BuiltInWidgets.java
@@ -190,7 +190,7 @@ public enum BuiltInWidgets implements WidgetType {
    */
   kSplitButtonChooser("Split Button Chooser"),
   /**
-   * Displays an {@link edu.wpi.first.wpilibj.Encoder} displaying its speed, total travelled
+   * Displays an {@link edu.wpi.first.wpilibj.Encoder} displaying its speed, total traveled
    * distance, and its distance per tick.
    * <br>Supported types:
    * <ul>
diff --git a/wpiutil/src/main/native/cpp/llvm/Unix/Path.inc b/wpiutil/src/main/native/cpp/llvm/Unix/Path.inc
index b7868135c9..4ec9e86a49 100644
--- a/wpiutil/src/main/native/cpp/llvm/Unix/Path.inc
+++ b/wpiutil/src/main/native/cpp/llvm/Unix/Path.inc
@@ -410,7 +410,7 @@ std::error_code openFileForRead(const Twine &Name, int &ResultFD,
     return std::error_code();
   RealPath->clear();
 #if defined(F_GETPATH)
-  // When F_GETPATH is availble, it is the quickest way to get
+  // When F_GETPATH is available, it is the quickest way to get
   // the real path name.
   char Buffer[MAXPATHLEN];
   if (::fcntl(ResultFD, F_GETPATH, Buffer) != -1)
diff --git a/wpiutil/src/main/native/include/wpi/ErrorHandling.h b/wpiutil/src/main/native/include/wpi/ErrorHandling.h
index ef5843ba48..5c89c5eeea 100644
--- a/wpiutil/src/main/native/include/wpi/ErrorHandling.h
+++ b/wpiutil/src/main/native/include/wpi/ErrorHandling.h
@@ -46,7 +46,7 @@ class StringRef;
   void install_fatal_error_handler(fatal_error_handler_t handler,
                                    void *user_data = nullptr);
 
-  /// Restores default error handling behaviour.
+  /// Restores default error handling behavior.
   void remove_fatal_error_handler();
 
   /// ScopedFatalErrorHandler - This is a simple helper class which just
diff --git a/wpiutil/src/main/native/include/wpi/Signal.h b/wpiutil/src/main/native/include/wpi/Signal.h
index d8109ff3ef..64b774cf4d 100644
--- a/wpiutil/src/main/native/include/wpi/Signal.h
+++ b/wpiutil/src/main/native/include/wpi/Signal.h
@@ -815,7 +815,7 @@ using Signal = SignalBase<detail::NullMutex, T...>;
  *
  * Beware of accidentally using recursive signal emission or cycles between
  * two or more signals in your code. Locking std::mutex more than once is
- * undefined behaviour, even if it "seems to work somehow". Use signal_r
+ * undefined behavior, even if it "seems to work somehow". Use signal_r
  * instead for that use case.
  */
 template <typename... T>