diff --git a/README.md b/README.md
index 23763dc..d616ab3 100644
--- a/README.md
+++ b/README.md
@@ -265,6 +265,8 @@ $credentialsProvider = function ($id) {
             '12345'      // identifier, default: null
         );
     }
+
+    throw new UnauthorizedException("Unknown credentials");
 };
 
 // A complete example