README in remarkable_activemodel-4.0.0.alpha1 vs README in remarkable_activemodel-4.0.0.alpha2

@@ -23,9 +23,22 @@
 
 * Matchers testing ActiveModel::Serialization
   This allows you to test for compliance if you are using special serialization
   methods, or require the use of Presenters in your application.
 
+== Installation
+
+  sudo gem install remarkable_activemodel --pre
+
+Add this to your Gemfile:
+
+  group :test do
+     gem 'remarkable_activemodel', '>=4.0.0.alpha2'
+  end
+
+Drop this into your spec/spec_helper.rb or spec/support/remarkable.rb file:
+
+  require 'remarkable/active_model'
 
 == Examples
 
 All Remarkable macros can be accessed in two different ways. For those who prefer the Shoulda style, let’s look at some model tests: