diff --git a/core/lib/Drupal/Core/Render/Element/OptGroup.php b/core/lib/Drupal/Core/Render/Element/OptGroup.php
index 16af17d..18f5479 100644
--- a/core/lib/Drupal/Core/Render/Element/OptGroup.php
+++ b/core/lib/Drupal/Core/Render/Element/OptGroup.php
@@ -62,8 +62,6 @@ public function getInfo() {
    * @see _form_validate()
    */
   public static function processOptGroup(&$element, FormStateInterface $form_state, &$complete_form) {
-    // @TODO This is ported from form_select_options(). But instead of
-    //   checking #value, #default_value should be used here and below, right?
     $value_valid = isset($element['#value']) || array_key_exists('#value', $element);
     $value_is_array = $value_valid && is_array($element['#value']);
     // Check if the element is multiple select and no value has been selected.