diff --git a/core/modules/entity/lib/Drupal/entity/EntityFormController.php b/core/modules/entity/lib/Drupal/entity/EntityFormController.php
index f2b26b9..6eea63b 100644
--- a/core/modules/entity/lib/Drupal/entity/EntityFormController.php
+++ b/core/modules/entity/lib/Drupal/entity/EntityFormController.php
@@ -147,6 +147,7 @@ class EntityFormController {
    */
   protected function actions(array $form, array &$form_state) {
     return array(
+      // @todo rename the action key from subnit to save.
       'submit' => array(
         '#value' => t('Save'),
         '#validate' => array(array($this, 'validate')),