--- a/contrib/check-commit	Wed Jan 18 20:03:00 2017 -0500
+++ b/contrib/check-commit	Wed Jan 18 23:34:35 2017 -0500
@@ -59,6 +59,10 @@
     exitcode = 0
     printed = node is None
     hits = []
+    signtag = (afterheader +
+          r'Added (tag [^ ]+|signature) for changeset [a-f0-9]{12}')
+    if re.search(signtag, commit):
+        return 0
     for exp, msg in errors:
         for m in re.finditer(exp, commit):
             end = m.end()