readd comment

morebits.js

@@ -459,6 +459,7 @@ Morebits.quickForm.element.prototype.compute = function QuickFormElementCompute(
 			node = document.createDocumentFragment();
 			// fragments can't have any attributes, so just return it straight away
 			return [ node, node ];
+		// Sometimes Twinkle uses fancy searchable "select" elements. This is powered by the third party library "select2". Activate it by creating a Morebits "select" element, then call `$('select[name=sub_group]').select2({});` or similar towards the end of your main code.
 		case 'select':
 			node = document.createElement('div');