diff --git a/docs/complianced_image/AMI/how_to_creating_and_making_an_AMI_public.mkd b/docs/complianced_image/AMI/how_to_creating_and_making_an_AMI_public.mkd
index 8d29d52..14de4c5 100644
--- a/docs/complianced_image/AMI/how_to_creating_and_making_an_AMI_public.mkd
+++ b/docs/complianced_image/AMI/how_to_creating_and_making_an_AMI_public.mkd
@@ -58,8 +58,10 @@ admin@ip:/opt/harbian-audit-master$ sudo sed -i "/^root/a\admin    ALL=(ALL:ALL)
 admin@ip:/opt/harbian-audit-master$ sudo reboot 
 ```
 After reboot: 
+
 ```
-admin@ip:/opt/harbian-audit-master$ sudo bash /opt/harbian-audit-master/docs/configurations/etc.iptables.rules.v4.sh
+admin@ip:/opt/harbian-audit-master$ INTERFACENAME="eth0"
+admin@ip:/opt/harbian-audit-master$ sudo bash /opt/harbian-audit-master/docs/configurations/etc.iptables.rules.v4.sh $INTERFACENAME 
 admin@ip:/opt/harbian-audit-master$ sudo -s 
 admin@ip:/opt/harbian-audit-master# iptables-save > /etc/iptables/rules.v4 
 admin@ip:/opt/harbian-audit-master# ip6tables-save > /etc/iptables/rules.v6
diff --git a/docs/configurations/etc.iptables.rules.v4.sh b/docs/configurations/etc.iptables.rules.v4.sh
index 2d7e2b2..694b134 100644
--- a/docs/configurations/etc.iptables.rules.v4.sh
+++ b/docs/configurations/etc.iptables.rules.v4.sh
@@ -3,7 +3,8 @@ IPT="/sbin/iptables"
 PUB_IFS="ens33"
 
 if [ $# -lt 1 ]; then
-	echo "Must be set to greater than or equal to a public network interface. usage: $0 eth0, or $0 eth0 eth1"
+	echo "Must be set to greater than or equal to a public network interface. "
+	echo "usage: $0 eth0, or $0 eth0 eth1"
 	exit 1
 else
 	PUB_IFS="$@"