howto/git.md

@@ -66,6 +66,7 @@ On the client-side:
 
 [`.mrconfig`]: https://gitlab.torproject.org/tpo/tpa/repos/-/blob/main/.mrconfig
 [hiera data for the puppetserver role]: https://gitlab.torproject.org/tpo/tpa/puppet-control/-/blob/production/data/roles/puppetserver.yaml
+[doc on `repos.git`]: https://gitlab.torproject.org/tpo/tpa/repos/-/blob/main/README.md
 
 Note: When the trust-root for a repository changes, it needs to be updated in
 the [hiera data for the puppetserver role][] and/or the [`.mrconfig`][] file,