Explicitly mention the permissions warning and chmod 600

certbot-dns-cloudxns/certbot_dns_cloudxns/__init__.py

@@ -16,6 +16,7 @@ Named Arguments
                                           (Default: 30)
 ========================================  =====================================
 
+
 Credentials
 -----------
 
@@ -43,6 +44,14 @@ to this file for use during renewal, but does not store the file's contents.
    certificates or revoke existing certificates for associated domains, even if
    those domains aren't being managed by this server.
 
+Certbot will emit a warning if it detects that the credentials file can be
+accessed by other users on your system. The warning reads "Unsafe permissions
+on credentials configuration file", followed by the path to the credentials
+file. This warning will be emitted each time Certbot uses the credentials file,
+including for renewal, and cannot be silenced except by addressing the issue
+(e.g., by using a command like ``chmod 600`` to restrict access to the file).
+
+
 Examples
 --------