changes to session config?

First off, great work on Rails Guides! Thank you.

Rails 2.3 changes

config.action_controller.sessions_store = :active_record_store

from config/environment.rb, to

ActionController::Base.session_store = :active_record_store

in config/initializers/session_store.rb

Although makes a
mention of this, it does not quite tell you where to configure the
session store information. Can/should this be added to the guide?