bind9 as local caching name server and /etc/resolv.conf

I'm trying to set up BIND9 as a local caching DNS server. I'm about to do that on all my systems: Linux, SmartOS, Mac OS X. Seems like it's quite easy to setup bind for that. My question is: Do I need to add "nameserver 127.0.0.1" to my /etc/resolv.conf in order to ask the local name server first? Or is that kind of automatic?