diff --git a/ui/jquery.ui.selectmenu.js b/ui/jquery.ui.selectmenu.js
index 76224fd7b..701991e3b 100644
--- a/ui/jquery.ui.selectmenu.js
+++ b/ui/jquery.ui.selectmenu.js
@@ -186,6 +186,7 @@ $.widget( "ui.selectmenu", {
 		if ( this.options.disabled ) {
 			return;
 		}
+		// Support: IE6-IE9 click doesn't trigger focus on the button
 		if ( !this.menuItems ) {
 			this.refresh();
 		}