diff --git a/lib/OpenLayers/Layer/UTFGrid.js b/lib/OpenLayers/Layer/UTFGrid.js
index 277cc4db70..223dfe27a1 100644
--- a/lib/OpenLayers/Layer/UTFGrid.js
+++ b/lib/OpenLayers/Layer/UTFGrid.js
@@ -5,6 +5,7 @@
 
 /**
  * @requires OpenLayers/Layer/Grid.js
+ * @requires OpenLayers/Tile/UTFGrid.js
  */
 
 /**