diff --git a/README.md b/README.md
index b96b8e9..c3c020b 100644
--- a/README.md
+++ b/README.md
@@ -59,5 +59,8 @@ See lemon.html for additional documentation.
 - %wildcard - Define WILDCARD token.
 - %token_class - **NOT SUPPORTED**
 
+## Lexer
+Used re2js lexer from: http://git.macaw.me:3000/chichenkov/re2-js-generator
+
 ## Original project
 See https://github.com/sormy/lemon-js
\ No newline at end of file