Usage You need to tell RuboCop to load the Workitcop extension. There are some ways to do this: RuboCop configuration file Put this into your .rubocop.yml: require: workitcop or, if you are using several extensions: require: - workitcop - rubocop-rspec Now you can run rubocop and it will automatically load the Workitcop cops together with the standard cops. $ rubocop --require workitcop Rake task RuboCop::RakeTask.new do |task| task.requires << 'workitcop' end Installation Cops