README.md in rubocop-rspec_rails-2.28.0 vs README.md in rubocop-rspec_rails-2.28.1

@@ -7,18 +7,20 @@
 [RSpec Rails](https://rspec.info/)-specific analysis for your projects, as an extension to
 [RuboCop](https://github.com/rubocop/rubocop).
 
 ## Installation
 
-Just install the `rubocop-rspec_rails` gem
+**This gem implicitly depends on the `rubocop-rspec` gem, so you should install it first.**
+Just install the `rubocop-rspec` and `rubocop-rspec_rails` gem
 
 ```bash
-gem install rubocop-rspec_rails
+gem install rubocop-rspec rubocop-rspec_rails
 ```
 
 or if you use bundler put this in your `Gemfile`
 
 ```ruby
+gem 'rubocop-rspec', require: false
 gem 'rubocop-rspec_rails', require: false
 ```
 
 ## Usage