Best place to set load path for new spec folders

I have a bunch of observers in RAILS_ROOT/spec/observers/ as well as
in some sub directories for some name spaced observers.

For example:

\spec
\observers
person_observer_spec.rb
\admin
user_observer_spec.rb

autospec doesn’t seem to want to pick them up. The box I am talking
about is on RSpec 1.1.5.

How to tell autospec to go hunt down the observers tree ?

Mikel