adding observers outside environment.rb

I need to add an ActiveRecord observer and thought I should follow Rails 2 intent by not changing the base environment.rb I create a file config/initializers/observers.rb but don't know what to add to it.

I can't add: config.active_record.observers = :user_observer Since "config" isn't defined in the scope of the initializer file and I don't know if it would be harmful to add a " do |config| " block.

So, is there a method to add an observer outside the environment.rb initializer block? Or is it ok to have a second initializers block in my other "initializers/" files?

thanks, Jon