Mailman+exim4 on Debian Etch howto?

Does anyone have a step by step howto for newbies on how to make Mailman

work with Exim4 on an Debian Etch system? The readme file says only this:

#

For users of exim: if you want to use the /etc/aliases file for mailman

aliases, you'll need to specify a user=list line or something like that

in the system_aliases director.

#

I don't understand what that means.