diff --git a/src/pixi/InteractionData.js b/src/pixi/InteractionData.js
index fbc8636..326007c 100644
--- a/src/pixi/InteractionData.js
+++ b/src/pixi/InteractionData.js
@@ -41,6 +41,7 @@
  * @method getLocalPosition
  * @param displayObject {DisplayObject} The DisplayObject that you would like the local coords off
  * @param [point] {Point} A Point object in which to store the value, optional (otherwise will create a new point)
+ * param [globalPos] {Point} A Point object containing your custom global coords, optional (otherwise will use the current global coords)
  * @return {Point} A point containing the coordinates of the InteractionData position relative to the DisplayObject
  */
 PIXI.InteractionData.prototype.getLocalPosition = function(displayObject, point, globalPos)