diff --git a/lib/internal/Magento/Framework/EntityManager/Operation/ExtensionInterface.php b/lib/internal/Magento/Framework/EntityManager/Operation/ExtensionInterface.php
index 2138b102b31fe..d925fe97bcea0 100644
--- a/lib/internal/Magento/Framework/EntityManager/Operation/ExtensionInterface.php
+++ b/lib/internal/Magento/Framework/EntityManager/Operation/ExtensionInterface.php
@@ -7,6 +7,7 @@
 
 /**
  * Interface ExtensionInterface
+ * @deprecated
  */
 interface ExtensionInterface
 {