m0n0wall Forum - Add Additional Network ?

I currently have my firewall configured with a single network and it runs great. My IP block is 10.10.150.224 - .239 and the firewall LAN is configured as .228.

I have now exhausted my IP set and was assigned a second set of IP addressses by my ISP. Now I am trying to add this second network to my firewall which I am having troubles doing (disclaimer - I am firewall retarded and know just enough to be dangerous).

My new IP block is 10.10.228.113 - .126.

Any ideas on how to do this? Do I add an OPT1 Interface?

Thanks in advance.

WRH