diff --git a/lib/OpenLayers/Layer/XYZ.js b/lib/OpenLayers/Layer/XYZ.js
index 89be7b24ea..def9dba45b 100644
--- a/lib/OpenLayers/Layer/XYZ.js
+++ b/lib/OpenLayers/Layer/XYZ.js
@@ -4,6 +4,7 @@
 
 /**
  * @requires OpenLayers/Layer/Grid.js
+ * @requires OpenLayers/Tile/Image.js
  */
 
 /**