¿Cómo incluyo un módulo en spec_helper.rb?

I am setting up testing for the paperclip gem and part of the instructions are this:

In spec_helper.rb, you'll need to require the matchers:

require "paperclip/matchers"

And include the module:

Spec::Runner.configure do |config|
  config.include Paperclip::Shoulda::Matchers
end

I am wondering if I should just paste:

Spec::Runner.configure do |config|
  config.include Paperclip::Shoulda::Matchers
end

into the spec_helper.rb file or if I should put it someone else and refer to it somehow in this file.

Gracias por toda tu ayuda :)