[Fab-user] "global name 'config' is not defined" am I doing something dumb?

[Mike Panchenko]

I have a file named fabfile.py and was literally just testing out basic functionality using 0.0.9 and the user guide.

def staging():
    config.fab_hosts = ['my.staging.host.com']

def hello_remote():
    """prints hello on the remote hosts"""
    run("echo hello from $(fab_host) to $(fab_user)")

I get

config.fab_hosts = ['my.staging.host.com']
NameError: global name 'config' is not defined

when I run 

fab staging hello_remote

am I missing something really trivial? All the sample files on git don't seem to have anything special defined for config before using it. Thanks.

Mike.