diff --git a/ui/jquery.ui.selectmenu.js b/ui/jquery.ui.selectmenu.js
index 95c463a08..a6ce85f0c 100644
--- a/ui/jquery.ui.selectmenu.js
+++ b/ui/jquery.ui.selectmenu.js
@@ -211,6 +211,7 @@ $.widget( "ui.selectmenu", {
 		this._toggleAttr();
 		this.menu.menu( "focus", event, this._getSelectedItem() );
 
+		// do not change position if non default position options are set (needed for custom positioned popup menus)
 		if ( this.items && !this.options.dropdown && this.options.position.my == "left top" && this.options.position.at == "left bottom" ) {
 			var currentItem = this._getSelectedItem();
 			// center current item