diff --git a/Synology-NAS-Guide.md b/Synology-NAS-Guide.md
index b352296..f20fe0e 100644
--- a/Synology-NAS-Guide.md
+++ b/Synology-NAS-Guide.md
@@ -49,7 +49,7 @@ Now it's time to create the certificate for your domain:
 cd /usr/local/share/acme.sh
 export CERT_DOMAIN="your-domain.tld"
 export CERT_DNS="dns_cf"
-./acme.sh --issue --server letsencrypt --home . -d "$CERT_DOMAIN" --dns "$CERT_DNS"
+./acme.sh --issue --server letsencrypt --home . -d "$CERT_DOMAIN" --dns "$CERT_DNS" --keylength 2048
 ```
 
 ## Deploy the default certificate