diff --git a/spine-libgdx/test/com/esotericsoftware/spine/AnimationStateTest.java b/spine-libgdx/test/com/esotericsoftware/spine/AnimationStateTest.java
index f744d0030..f31506f3a 100644
--- a/spine-libgdx/test/com/esotericsoftware/spine/AnimationStateTest.java
+++ b/spine-libgdx/test/com/esotericsoftware/spine/AnimationStateTest.java
@@ -129,7 +129,7 @@ public class AnimationStateTest extends ApplicationAdapter {
 	}
 
 	public void render () {
-		state.update(Gdx.graphics.getDeltaTime());
+		state.update(Gdx.graphics.getDeltaTime()); // Update the animation time.
 
 		Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);