Link to source grammar in README

README.md

@@ -3,4 +3,4 @@ node-tree-sitter-c
 
 [![Build Status](https://travis-ci.org/maxbrunsfeld/node-tree-sitter-c.svg?branch=master)](https://travis-ci.org/maxbrunsfeld/node-tree-sitter-c)
 
-C grammar for node-tree-sitter
+C grammar for [node-tree-sitter](https://github.com/maxbrunsfeld/node-tree-sitter). Adapted from [this C99 grammar](http://slps.github.io/zoo/c/iso-9899-tc3.html#designation).