diff --git a/lib/internal/Magento/Framework/Event/ObserverInterface.php b/lib/internal/Magento/Framework/Event/ObserverInterface.php
index 09358e0966216..e7c9b770ea1f5 100644
--- a/lib/internal/Magento/Framework/Event/ObserverInterface.php
+++ b/lib/internal/Magento/Framework/Event/ObserverInterface.php
@@ -10,6 +10,7 @@
 /**
  * Interface \Magento\Framework\Event\ObserverInterface
  *
+ * @api
  */
 interface ObserverInterface
 {