README.md in pronto-brakeman-0.6.0 vs README.md in pronto-brakeman-0.7.0

@@ -4,5 +4,11 @@
 [![Build Status](https://travis-ci.org/mmozuras/pronto-brakeman.png)](https://travis-ci.org/mmozuras/pronto-brakeman)
 [![Gem Version](https://badge.fury.io/rb/pronto-brakeman.png)](http://badge.fury.io/rb/pronto-brakeman)
 [![Dependency Status](https://gemnasium.com/mmozuras/pronto-brakeman.png)](https://gemnasium.com/mmozuras/pronto-brakeman)
 
 Pronto runner for [Brakeman](https://github.com/presidentbeef/brakeman), security vulnerability scanner for RoR. [What is Pronto?](https://github.com/mmozuras/pronto)
+
+## Severity mapping
+
+Brakeman [Confiedence](https://github.com/presidentbeef/brakeman#confidence-levels) is mapped to severity levels on the
+messages generated by Pronto. High confidence maps to fatal, medium confidence maps to warning, and low confidence maps
+to info.