test.rb

module Foo
  def say(text)
    puts "Foo::say #{text}"
  end
end

class Craig
  include Foo
  def say(text)
    super
    puts "Craig say: #{text}"
  end
end

c = Craig.new
c.say('hello')

---

cpjolicoeur $ ruby test.rb 
Foo::say hello
Craig say: hello