README.md in to_source-0.2.17 vs README.md in to_source-0.2.18

@@ -4,11 +4,17 @@
 [![Build Status](https://secure.travis-ci.org/mbj/to_source.png?branch=master)](http://travis-ci.org/mbj/to_source)
 [![Dependency Status](https://gemnasium.com/mbj/to_source.png)](https://gemnasium.com/mbj/to_source)
 [![Code Climate](https://codeclimate.com/badge.png)](https://codeclimate.com/github/mbj/to_source)
 
 Reverse parser to generate source code from the Rubinius AST. Also works well under MRI using the mutant-melbourne gem.
-
 Currently only support for 1.9 mode!
+
+To source is the backend of [mutant](https://github.com/mbj/mutant) it is used to create the (mutated) source that is 
+evaled into the vm. Also for creating the diffs.
+
+It should be able to create equivalent, but not identical, source. The current focus is to create *correct* but not 
+*beautiful* source. Once correctnes is at 100% I'll focus on beautifullnes, so pls do not complain about excess of 
+parantheses now ;).
 
 Installation
 ------------
 
 Install the gem ```to_source``` via your preferred method.