README.md in rails_extras-0.1.3 vs README.md in rails_extras-0.1.4

@@ -17,17 +17,41 @@
 
     $ gem install rails_extras
 
 ## Usage
 
+### Helper
+
 ```ruby
 add_link('http://example.com', class: 'text-info') do |tag|
   tag.space "link"
   [1, 2, 3].each do |item|
     tag << item.to_s
   end
 end #=> <a href='http://example.com', class: 'text-info'>link 123</a>
 ```
+
+### RSpec
+
+Some times are tests which are faster than browser can reload or load page
+(click link). For this situations we should use ```wait_for_ajax``` mathod.
+If you want use this method you first should add to file ```spec_helper.rb```
+this configuration
+
+```ruby
+RSpec.configure do |config|
+  config.include ::RailsExtras::RSpec::Support::WaitForAjax, type: :feature
+end
+```
+
+and then you can add ```wait_for_ajax``` method to your scenario
+
+```ruby
+click_button "Next"
+wait_for_ajax
+expect(page).to have_content "Next page"
+```
+
 # License
 
 RailsExtras uses the MIT license. Please check the [LICENSE][] file for more details.
 
 [license]: https://github.com/raglub/rails_extras/blob/master/LICENSE