declarative authorization rules filename

Hi,

The declarative authorization gem looks for it's rules by default in a
file named authorization_rules.rb within config.

I want to change the name of the rules file but can't find a way in the
docs to tell declarative authorization to point at a different location
short of reassigning the AUTH_DSL_FILE constant which throws a warning.

What is the correct way of doing this?

Cheers, Phil