diff --git a/Synology-NAS-Guide.md b/Synology-NAS-Guide.md
index 7a3b21f..b352296 100644
--- a/Synology-NAS-Guide.md
+++ b/Synology-NAS-Guide.md
@@ -123,7 +123,7 @@ In DSM control panel, open the 'Task Scheduler' and create a new scheduled task
 
 ```sh
 # renew certificates 
-./acme.sh --cron --home .
+/usr/local/share/acme.sh/acme.sh --cron --home /usr/local/share/acme.sh
 ```
 
 ## Fix a broken environment after Synology DSM upgrade