diff --git a/src/Repositories/RefreshTokenRepositoryInterface.php b/src/Repositories/RefreshTokenRepositoryInterface.php
index 0c0697bf..a769cf6d 100644
--- a/src/Repositories/RefreshTokenRepositoryInterface.php
+++ b/src/Repositories/RefreshTokenRepositoryInterface.php
@@ -20,7 +20,7 @@ interface RefreshTokenRepositoryInterface extends RepositoryInterface
     /**
      * Creates a new refresh token
      *
-     * @return RefreshTokenEntityInterface
+     * @return RefreshTokenEntityInterface|null
      */
     public function getNewRefreshToken();