In the section “Commit log requirements”, HACKING links to page <http://www.gnu.org/software/guile/changelogs/guile-changelogs_3.html> which returns 404 Not Found.

(I was able to find this content via the Wayback Machine at <https://web.archive.org/web/20151008204941/http://www.gnu.org:80/software/guile/changelogs/guile-changelogs_3.html>, but it would be better if I didn’t have to do that)

-- 
Peter Oliver