How to make Terminal prompt change permanent?

I am using OS X Lion v10.7.2 and want to change my terminal prompt, but everytime I shutdown and restart Terminal, it defaults back to the original.

I am using
export PS1="\w >"

Thanks

If you don't have one, copy /etc/bashrc and/or /etc/profile to your user folder.
Rename them .bashrc and .bash_profile (notice the periods in front of name, this makes them hidden)
Now type, in Terminal, nano .bashrc. Nano is an editor. Add your command to the file, save it, then close it.
Restart Terminal. Ta da!!