README.md in pronto-rubocop-0.6.1 vs README.md in pronto-rubocop-0.6.2

@@ -8,5 +8,6 @@
 Pronto runner for [Rubocop](https://github.com/bbatsov/rubocop), ruby code analyzer. [What is Pronto?](https://github.com/mmozuras/pronto)
 
 ## Configuration
 
 Configuring Rubocop via .rubocop.yml will work just fine with pronto-rubocop.
+You can also specify a custom `.rubocop.yml` location with the environment variable `RUBOCOP_CONFIG`