diff --git a/git_config.py b/git_config.py
index cdfeddd..9b3dd25 100644
--- a/git_config.py
+++ b/git_config.py
@@ -699,7 +699,8 @@
     if not rev.startswith(R_HEADS):
       return rev
 
-    raise GitError('remote %s does not have %s' % (self.name, rev))
+    raise GitError('%s: remote %s does not have %s' %
+                   (self.projectname, self.name, rev))
 
   def WritesTo(self, ref):
     """True if the remote stores to the tracking ref.