From ddef473e07a605de9141836ceeba1dd11e3fa84a Mon Sep 17 00:00:00 2001
From: Todd Volkert <tvolkert@users.noreply.github.com>
Date: Mon, 27 May 2019 10:17:09 -0700
Subject: [PATCH] Add clarification in Animation's listener API docs (#33363)

---
 packages/flutter/lib/src/animation/animation.dart | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/flutter/lib/src/animation/animation.dart b/packages/flutter/lib/src/animation/animation.dart
index 041d1a2f24..8522785351 100644
--- a/packages/flutter/lib/src/animation/animation.dart
+++ b/packages/flutter/lib/src/animation/animation.dart
@@ -63,6 +63,9 @@ abstract class Animation<T> extends Listenable implements ValueListenable<T> {
 
   /// Stop calling the listener every time the value of the animation changes.
   ///
+  /// If `listener` is not currently registered as a listener, this method does
+  /// nothing.
+  ///
   /// Listeners can be added with [addListener].
   @override
   void removeListener(VoidCallback listener);
@@ -74,6 +77,9 @@ abstract class Animation<T> extends Listenable implements ValueListenable<T> {
 
   /// Stops calling the listener every time the status of the animation changes.
   ///
+  /// If `listener` is not currently registered as a status listener, this
+  /// method does nothing.
+  ///
   /// Listeners can be added with [addStatusListener].
   void removeStatusListener(AnimationStatusListener listener);