diff --git a/lib/OpenLayers/Control/NavigationHistory.js b/lib/OpenLayers/Control/NavigationHistory.js
index e9e782b72d..b7b37aa351 100644
--- a/lib/OpenLayers/Control/NavigationHistory.js
+++ b/lib/OpenLayers/Control/NavigationHistory.js
@@ -4,6 +4,7 @@
 
 /**
  * @requires OpenLayers/Control.js
+ * @requires OpenLayers/Control/Button.js
  */
 
 /**