diff --git a/packages/animations/src/players/animation_player.ts b/packages/animations/src/players/animation_player.ts
index 82bd88c5bdc..c0705edb401 100644
--- a/packages/animations/src/players/animation_player.ts
+++ b/packages/animations/src/players/animation_player.ts
@@ -75,12 +75,12 @@ export interface AnimationPlayer {
   reset(): void;
   /**
    * Sets the position of the animation.
-   * @param position A 0-based offset into the duration, in milliseconds.
+   * @param position A fractional value, representing the progress through the animation.
    */
   setPosition(position: number): void;
   /**
    * Reports the current position of the animation.
-   * @returns A 0-based offset into the duration, in milliseconds.
+   * @returns A fractional value, representing the progress through the animation.
    */
   getPosition(): number;
   /**