diff --git a/HowtoDebian/MigrationJessieStretch.md b/HowtoDebian/MigrationJessieStretch.md
index 206c6f97..36ffd1d5 100644
--- a/HowtoDebian/MigrationJessieStretch.md
+++ b/HowtoDebian/MigrationJessieStretch.md
@@ -233,6 +233,10 @@ RewriteRule /(.*)           ws://127.0.0.1:8080/$1 [P,L]
 
 Il faut rajouter /usr/share/php/php-php-gettext a la directive open_basedir de /etc/phpmyadmin/apache.conf.
 
+## Certbot
+
+[https://wiki.evolix.org/HowtoLetsEncrypt#mise-%C3%A0-jour-de-certbot-vers-debian-9](Mise-à-jour de certbot vers Debian 9)
+
 ## Xorg
 
 `startx` ou `startxfce4` donne : `parse_vt_settings /dev/tty0 (permission denied)`