diff --git a/lib/OpenLayers/Icon.js b/lib/OpenLayers/Icon.js
index f6870665d3..2f55cde810 100644
--- a/lib/OpenLayers/Icon.js
+++ b/lib/OpenLayers/Icon.js
@@ -59,6 +59,7 @@ OpenLayers.Icon = OpenLayers.Class({
      *
      * url - {String} 
      * size - {<OpenLayers.Size>} 
+     * offset - {<OpenLayers.Pixel>}
      * calculateOffset - {Function} 
      */
     initialize: function(url, size, offset, calculateOffset) {