diff --git a/seed/systemd/DEBUG.md b/seed/systemd/DEBUG.md
new file mode 100644
index 00000000..6c54ea3d
--- /dev/null
+++ b/seed/systemd/DEBUG.md
@@ -0,0 +1,16 @@
+Debug systemd-networkd
+=======================
+
+Dans /usr/lib/systemd/system/systemd-networkd.service ajouter :
+
+```
+[Service]
+Environment=SYSTEMD_LOG_LEVEL=debug
+```
+
+Redémarrer :
+
+```
+machinectl reboot lemonldap.in.silique.fr
+machinectl shell lemonldap.in.silique.fr /usr/bin/networkctl status -l -a
+```