doc: note how to install git send-email

* doc/contributing.texi (git send-email): Add install instructions.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

diff --git a/doc/contributing.texi b/doc/contributing.texi
index e00634e..7f23014 100644 (file)
--- a/doc/contributing.texi
+++ b/doc/contributing.texi
@@ -982,5 +982,6 @@ first send one message to @email{guix-patches@@gnu.org}, and then send
 subsequent patches to @email{@var{NNN}@@debbugs.gnu.org} to make sure
 they are kept together.  See
 @uref{https://debbugs.gnu.org/Advanced.html, the Debbugs documentation}
-for more information.
+for more information.  You can install @command{git send-email} with
+@command{guix install git:send-email}.
 @c Debbugs bug: https://debbugs.gnu.org/db/15/15361.html