-files in '/etc/pve/local/pve-ssl.pem'/'etc/pve/local/pve-ssl.key' or
-the cluster CA files in '/etc/pve/pve-root-ca.pem'/'/etc/pve/priv/pve-root-ca.key'.
+files in `/etc/pve/local/pve-ssl.pem` and `etc/pve/local/pve-ssl.key` or
+the cluster CA files in `/etc/pve/pve-root-ca.pem` and
+`/etc/pve/priv/pve-root-ca.key`.
+
+NOTE: There is a detailed HOWTO for configuring commercial HTTPS certificates
+on the {webwiki-url}HTTPS_Certificate_Configuration_(Version_4.x_and_newer)[wiki],
+including setup instructions for obtaining certificates from the popular free
+Let's Encrypt certificate authority.