diff --git a/core/modules/workflows/src/WorkflowDeleteAccessCheck.php b/core/modules/workflows/src/WorkflowDeleteAccessCheck.php
index df3b7dd27017c86bc00eaea23eec7487525d68ba..adbcddd95d45c64ca781c2d500e6ad0c7e61e307 100644
--- a/core/modules/workflows/src/WorkflowDeleteAccessCheck.php
+++ b/core/modules/workflows/src/WorkflowDeleteAccessCheck.php
@@ -11,6 +11,10 @@
 
 /**
  * Provides a access checker for deleting a workflow state.
+ *
+ * @internal
+ *   Marked as internal until it's validated this should form part of the public
+ *   API in https://www.drupal.org/node/2897148.
  */
 class WorkflowDeleteAccessCheck implements AccessInterface {