diff --git a/Simple-guide-to-add-TLS-cert-to-cpanel.md b/Simple-guide-to-add-TLS-cert-to-cpanel.md
index 386ec3c..ed12088 100644
--- a/Simple-guide-to-add-TLS-cert-to-cpanel.md
+++ b/Simple-guide-to-add-TLS-cert-to-cpanel.md
@@ -29,6 +29,10 @@ Log-off and login to SSH again, or run the following command:
 
     source ~/.bashrc
 
+Tell acme.sh to set Let's Encrypt as the default CA server (required since Aug 2021):
+
+    acme.sh --set-default-ca  --server  letsencrypt
+
 Register a Let's Encrypt account with your email, so you can be notified of any renewal issues:
 
     acme.sh --register-account --accountemail email@example.com