diff --git a/src/as/com/threerings/flash/Animation.as b/src/as/com/threerings/flash/Animation.as
index 53a68e16..ae8a38fb 100644
--- a/src/as/com/threerings/flash/Animation.as
+++ b/src/as/com/threerings/flash/Animation.as
@@ -25,7 +25,7 @@ public interface Animation
 {
     /**
      * The primary working method for your animation. The argument indicates how
-     * many milliseconds have passed since the previous update.
+     * many milliseconds have passed since the animation was started.
      */
     function updateAnimation (elapsed :Number) :void;
 }