diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php b/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
index 868fdff..5b29e87 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
@@ -130,6 +130,10 @@ public function getOriginalId() {
    * {@inheritdoc}
    */
   public function setOriginalId($id) {
+    // Do not call the parent method since that would mark this entity as no
+    // longer new. Unlike content entities new configuration entities have an
+    // ID.
+    // @see https://www.drupal.org/node/2405165
     $this->originalId = $id;
     return $this;
   }