diff --git a/wpilibc/src/main/native/include/frc/AddressableLED.h b/wpilibc/src/main/native/include/frc/AddressableLED.h
index 5534ae4dd1..1d95ec5920 100644
--- a/wpilibc/src/main/native/include/frc/AddressableLED.h
+++ b/wpilibc/src/main/native/include/frc/AddressableLED.h
@@ -1,5 +1,5 @@
 /*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
+/* Copyright (c) 2019-2020 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.                                                               */
@@ -22,6 +22,8 @@ namespace frc {
 
 /**
  * A class for driving addressable LEDs, such as WS2812s and NeoPixels.
+ *
+ * <p>Only 1 LED driver is currently supported by the roboRIO.
  */
 class AddressableLED : public ErrorBase {
  public:
@@ -83,7 +85,7 @@ class AddressableLED : public ErrorBase {
   /**
    * Constructs a new driver for a specific port.
    *
-   * @param port the output port to use (Must be a PWM port)
+   * @param port the output port to use (Must be a PWM header)
    */
   explicit AddressableLED(int port);
 
@@ -95,6 +97,8 @@ class AddressableLED : public ErrorBase {
    * <p>Calling this is an expensive call, so its best to call it once, then
    * just update data.
    *
+   * <p>The max length is 5460 LEDs.
+   *
    * @param length the strip length
    */
   void SetLength(int length);
diff --git a/wpilibj/src/main/java/edu/wpi/first/wpilibj/AddressableLED.java b/wpilibj/src/main/java/edu/wpi/first/wpilibj/AddressableLED.java
index 223c6f20a7..f2ab81b9fd 100644
--- a/wpilibj/src/main/java/edu/wpi/first/wpilibj/AddressableLED.java
+++ b/wpilibj/src/main/java/edu/wpi/first/wpilibj/AddressableLED.java
@@ -1,5 +1,5 @@
 /*----------------------------------------------------------------------------*/
-/* Copyright (c) 2019 FIRST. All Rights Reserved.                             */
+/* Copyright (c) 2019-2020 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.                                                               */
@@ -14,6 +14,8 @@ import edu.wpi.first.hal.PWMJNI;
 
 /**
  * A class for driving addressable LEDs, such as WS2812s and NeoPixels.
+ *
+ * <p>Only 1 LED driver is currently supported by the roboRIO.
  */
 public class AddressableLED implements AutoCloseable {
   private final int m_pwmHandle;
@@ -22,7 +24,7 @@ public class AddressableLED implements AutoCloseable {
   /**
    * Constructs a new driver for a specific port.
    *
-   * @param port the output port to use (Must be a PWM port)
+   * @param port the output port to use (Must be a PWM header, not on MXP)
    */
   public AddressableLED(int port) {
     m_pwmHandle = PWMJNI.initializePWMPort(HAL.getPort((byte) port));
@@ -45,6 +47,8 @@ public class AddressableLED implements AutoCloseable {
    *
    * <p>Calling this is an expensive call, so its best to call it once, then just update data.
    *
+   * <p>The max length is 5460 LEDs.
+   *
    * @param length the strip length
    */
   public void setLength(int length) {