Adding comment option to iptables rule

Change-Id: I9d93052cfc197a364b42240448344d5543e8805f
diff --git a/README.rst b/README.rst
index 1f59c08..7fbd803 100644
--- a/README.rst
+++ b/README.rst
@@ -88,6 +88,7 @@
                   destination_port: 22
                   source_network: 192.168.1.0/24
                   jump: ACCEPT
+                  comment: Blah
 
 IPv6 is supported as well