without external resources. Instead of giving a URL to a mailing list
archive, summarize the relevant points of the discussion.
+If you want to reference a previous commit in the history of a stable
+branch use the format "abbreviated sha1 (subject, date)". So for example
+like this: "Commit f86a374 (pack-bitmap.c: fix a memleak, 2015-03-30)
+noticed [...]".
+
(3) Generate your patch using Git tools out of your commits.