diff --git a/HowtoLetsEncrypt.md b/HowtoLetsEncrypt.md
index 02d62937..18754b0f 100644
--- a/HowtoLetsEncrypt.md
+++ b/HowtoLetsEncrypt.md
@@ -73,16 +73,26 @@ Alias /.well-known/acme-challenge /var/lib/letsencrypt/.well-known/acme-challeng
 
 #### Nginx
 
-Configuration :
+Configuration Jessie :
 
 ~~~
-location /.well-known/acme-challenge {
+location ~ /.well-known/acme-challenge {
     alias /var/lib/letsencrypt/.well-known/acme-challenge;
     try_files $uri =404;
     allow all;
 }
 ~~~
 
+Configuration Stretch :
+
+~~~
+location ~ /.well-known/acme-challenge {
+    alias /var/lib/letsencrypt/
+    try_files $uri =404;
+    allow all;
+}
+~~~
+
 
 ## Génération du certificat