diff --git a/docs/PortKnocking.xml b/docs/PortKnocking.xml
index 1140c4e1c..73bd5c6ee 100644
--- a/docs/PortKnocking.xml
+++ b/docs/PortKnocking.xml
@@ -116,7 +116,7 @@ if ( $level ) {
     log_rule_limit( $level,
                     $chainref,
                     'SSHKnock',
-                    'DROP'
+                    'DROP',
                     '',
                     $tag,
                     'add',