README.md in iruby-rails-1.0.0 vs README.md in iruby-rails-1.1.0

@@ -10,9 +10,13 @@
 
 Add this line to your application's Gemfile:
 
 ```ruby
 gem 'iruby-rails', group: :development
+
+# You have to specify which cztop or ffi-rzmq do you use for ZMQ
+gem 'cztop'
+# gem 'ffi-rzmq'
 ```
 
 And then execute:
 
     $ bundle