diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigEntityType.php b/core/lib/Drupal/Core/Config/Entity/ConfigEntityType.php
index 1804651311..d462adb08d 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigEntityType.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigEntityType.php
@@ -167,7 +167,8 @@ public function getPropertiesToExport($id = NULL) {
       }
     }
     else {
-      // @todo deprecate this path.
+      // @todo https://www.drupal.org/project/drupal/issues/2949021 Deprecate
+      //   fallback to schema.
       $config_name = $this->getConfigPrefix() . '.' . $id;
       $definition = \Drupal::service('config.typed')->getDefinition($config_name);
       if (!isset($definition['mapping'])) {