diff --git a/js/ComboBoxListBox.js b/js/ComboBoxListBox.js
index b9c620de..eff0cc8f 100644
--- a/js/ComboBoxListBox.js
+++ b/js/ComboBoxListBox.js
@@ -106,7 +106,7 @@ define( require => {
         },
 
         // Handle keyup on each item in the list box, for a11y.
-        //TODO scenery#931 we're currently using keyup because of a general problem with keydown firing continuously
+        //TODO sun#447, scenery#931 we're currently using keyup because of a general problem with keydown firing continuously
         keyup: event => {
           if ( KeyboardUtil.KEY_ENTER === event.domEvent.keyCode || KeyboardUtil.KEY_SPACE === event.domEvent.keyCode ) {
             firedEmitter.emit( event );