firing one e-mail per ref when used naively, though. The
<<post-receive,'post-receive'>> hook is more suited to that.
-Another use suggested on the mailing list is to use this hook to
-implement access control which is finer grained than the one
-based on filesystem group.
+In an environment that restricts the users' access only to git
+commands over the wire, this hook can be used to implement access
+control without relying on filesystem ownership and group
+membership. See linkgit:git-shell[1] for how you might use the login
+shell to restrict the user's access to only git commands.
Both standard output and standard error output are forwarded to
'git send-pack' on the other end, so you can simply `echo` messages