diff --git a/README.md b/README.md
index c24c0ee..c61b280 100644
--- a/README.md
+++ b/README.md
@@ -11,4 +11,10 @@ You can pass in the `-f|--force` option to force the script to run.
 
 
 # Backup Router
-The opnsense-carp-dhcp-backup.php should be saved to `/usr/local/etc/rc.syshook.d/config/20-opnsense-carp-dhcp-master` and made executable. This will update the gateway IP after the config is updated. Please replace the varaibles with your own values.
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+The opnsense-carp-dhcp-backup.php should be saved to `/usr/local/etc/rc.syshook.d/config/20-opnsense-carp-dhcp-master` and made executable. This will update the gateway IP after the config is updated. Please replace the varaibles with your own values.
+
+## Variables
+$wanInterface: This should be the wan interface as default.  It could also be another opt# interface name as well.
+$gatewayName: should be the name of the manual gateway used for the static WAN IP.
+$wanStaticIP: This should be the private IP address for the Static WAN Interface.
+$wanStaticIPSubnet: This should be the subnet bits for the Static WAN Interafce, ex. 30
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