diff --git a/tools/normalize_acl.py b/tools/normalize_acl.py
index 3deb85432a..6852ba72ba 100755
--- a/tools/normalize_acl.py
+++ b/tools/normalize_acl.py
@@ -66,7 +66,7 @@ for line in aclfd:
         acl[section].append(line)
     # WTF
     else:
-        raise Exception('Unrecognized line!')
+        raise Exception('Unrecognized line: "%s"' % line)
 aclfd.close()
 
 if '2' in transformations: