diff --git a/content/en/docs/reference/access-authn-authz/authentication.md b/content/en/docs/reference/access-authn-authz/authentication.md
index 17702520e4..0a830586f0 100644
--- a/content/en/docs/reference/access-authn-authz/authentication.md
+++ b/content/en/docs/reference/access-authn-authz/authentication.md
@@ -458,7 +458,7 @@ clusters:
   - name: name-of-remote-authn-service
     cluster:
       certificate-authority: /path/to/ca.pem         # CA for verifying the remote service.
-      server: https://authn.example.com/authenticate # URL of remote service to query. Must use 'https'.
+      server: https://authn.example.com/authenticate # URL of remote service to query. 'https' recommended for production.
 
 # users refers to the API server's webhook configuration.
 users: