diff --git a/lib/OpenLayers/Control/OverviewMap.js b/lib/OpenLayers/Control/OverviewMap.js
index f90fd7d54a..3b23300402 100644
--- a/lib/OpenLayers/Control/OverviewMap.js
+++ b/lib/OpenLayers/Control/OverviewMap.js
@@ -676,11 +676,14 @@ OpenLayers.Control.OverviewMap = OpenLayers.Class(OpenLayers.Control, {
      * Get a map location from a pixel location
      *
      * Parameters:
-     * overviewMapPx - {<OpenLayers.Pixel>}
+     * overviewMapPx - {<OpenLayers.Pixel>|Object} OpenLayers.Pixel or
+     *                                             an object with a
+     *                                             'x' and 'y' properties.
      *
      * Returns:
-     * {<OpenLayers.LonLat>} Location which is the passed-in overview map
-     * OpenLayers.Pixel, translated into lon/lat by the overview map
+     * {Object} Location which is the passed-in overview map
+     * OpenLayers.Pixel, translated into lon/lat by the overview
+     * map. An object with a 'lon' and 'lat' properties.
      */
     getLonLatFromOverviewPx: function(overviewMapPx) {
         var size = this.ovmap.size;