diff --git a/tuf/__init__.py b/tuf/__init__.py
index 4be6efda..2e2db6b0 100755
--- a/tuf/__init__.py
+++ b/tuf/__init__.py
@@ -171,7 +171,7 @@ def __init__(self, metadata_role_name):
     self.metadata_role_name = metadata_role_name
 
   def __str__(self):
-    return str(self.metadata_role_name)+' metadata bad signature!'
+    return str(self.metadata_role_name)+' metadata has bad signature!'