diff --git a/infra/letsencrypt.md b/infra/letsencrypt.md
index 00e3cbd..3292ae3 100644
--- a/infra/letsencrypt.md
+++ b/infra/letsencrypt.md
@@ -24,4 +24,19 @@ Lancer la génération :
 /usr/bin/dehydrated -c
 ```
 
-Le certificat est généré dans `/var/lib/dehydrated/certs/foo.libre-service.eu/`.
\ No newline at end of file
+Le certificat est généré dans `/var/lib/dehydrated/certs/foo.libre-service.eu/`.
+
+# Renouvellement automatique
+
+Ajouter un script cron dans `/etc/cron.weekly/dehydrated` :
+```
+#!/bin/bash
+
+/usr/bin/dehydrated -c
+systemctl reload apache2.service
+```
+
+Et lui donner les bonnes permissions :
+```
+chmod a+rx /etc/cron.weekly/dehydrated
+```