diff --git a/packages/flutter/lib/src/animation/animation_controller.dart b/packages/flutter/lib/src/animation/animation_controller.dart
index 84be9c42548..3fad55df811 100644
--- a/packages/flutter/lib/src/animation/animation_controller.dart
+++ b/packages/flutter/lib/src/animation/animation_controller.dart
@@ -312,7 +312,7 @@ class AnimationController extends Animation<double>
 
   /// The length of time this animation should last when going in [reverse].
   ///
-  /// The value of [duration] us used if [reverseDuration] is not specified or
+  /// The value of [duration] is used if [reverseDuration] is not specified or
   /// set to null.
   Duration? reverseDuration;