+After ``git pull``, build with the same result link, link the unit
+again, reload the user manager, and restart the service:
+
+.. code:: console
+
+ nix build --out-link result-service
+ systemctl --user link --force "$(realpath result-service/share/systemd/user/onechat.service)"
+ systemctl --user daemon-reload
+ systemctl --user restart onechat.service
+