diff --git a/lib/form/yui/dateselector/dateselector.js b/lib/form/yui/dateselector/dateselector.js
index b1d5ced87e9..478a6e51d06 100644
--- a/lib/form/yui/dateselector/dateselector.js
+++ b/lib/form/yui/dateselector/dateselector.js
@@ -48,6 +48,9 @@ YUI.add('moodle-form-dateselector', function(Y) {
      *
      * YUI Bug: http://yuilibrary.com/projects/yui3/ticket/2529157
      * Example location: lib/yui/3.1.1/build/dom/dom-debug.js
+     *
+     * Moodle tracker issue to clean this up when required:
+     *      http://tracker.moodle.org/browse/MDL-23829
      */
     Y.DOM.inDoc = function(element, doc) {
         // there may be multiple elements with the same ID