Update README.md

Author: TysonAndre

README.md

@@ -4,7 +4,9 @@ PHP-Parser to php-ast
 [![Build Status](https://travis-ci.org/TysonAndre/php-parser-to-php-ast.svg?branch=master)](https://travis-ci.org/TysonAndre/php-parser-to-php-ast)
 
 This converts ASTs(Abstract Syntax Trees) from [PHP-Parser](https://github.com/nikic/PHP-Parser) to [php-ast](https://github.com/nikic/php-ast/).
-It can be used as a PHP-only implementation of php-ast.
+It can be used as a PHP-only implementation of php-ast. It can alternatively be used as a best-effort parser for syntactically valid PHP code.
+
+Also see https://github.com/TysonAndre/tolerant-php-parser-to-php-ast (in progress, may have better results)
 
 Supported [php-ast AST versions](https://github.com/nikic/php-ast#version-changelog): 40, 45, 50