README.md in fitting-2.12.0 vs README.md in fitting-2.12.1

@@ -10,12 +10,14 @@
 This gem will help you implement your API in strict accordance to the documentation in [API Blueprint](https://apiblueprint.org/) format.
 To do this, when you run your RSpec tests on controllers, it automatically searches for the corresponding json-schemas in the documentation and then validates responses with them.
 
 ## Installation
 
-Add this line to your application's Gemfile:
+First you need to install [drafter](https://github.com/apiaryio/drafter).
 
+Second add this line to your application's Gemfile:
+
 ```ruby
 gem 'fitting'
 ```
 
 And then execute:
@@ -80,10 +82,20 @@
 
 ## Check documentation cover
 
 ### xs size
 
-For match routes and valid json-schemas run `rake fitting:documentation_responses[xs]`
+For match routes and valid json-schemas run
+
+for bash
+```
+rake fitting:documentation_responses[xs]
+```
+
+for zsh
+```
+rake 'fitting:documentation_responses[xs]'
+```
 
 You will get statistics:
 
 ```
 Fully conforming requests: