diff --git a/Xcode-iOS/Demos/src/fireworks.c b/Xcode-iOS/Demos/src/fireworks.c
index 1006fa0..dbbd738 100644
--- a/Xcode-iOS/Demos/src/fireworks.c
+++ b/Xcode-iOS/Demos/src/fireworks.c
@@ -71,7 +71,7 @@
 }
 
 /*
-    steps each active particle by timestep MILLESECONDS_PER_FRAME
+    steps each active particle by timestep deltaTime
 */
 void
 stepParticles(double deltaTime)