diff --git a/core/modules/comment/src/Plugin/Field/FieldType/CommentItem.php b/core/modules/comment/src/Plugin/Field/FieldType/CommentItem.php
index 7fc6613..5b94740 100644
--- a/core/modules/comment/src/Plugin/Field/FieldType/CommentItem.php
+++ b/core/modules/comment/src/Plugin/Field/FieldType/CommentItem.php
@@ -199,6 +199,7 @@ public function settingsForm(array &$form, array &$form_state, $has_data) {
     $element = array();
 
     // @todo Inject entity storage once typed-data supports container injection.
+    // See https://drupal.org/node/2053415 for more details.
     $comment_types = CommentType::loadMultiple();
     $options = array();
     $entity_type = $this->getEntity()->getEntityTypeId();