From dce50596f5b740dc4306da3aa0e5e91eb6fffd10 Mon Sep 17 00:00:00 2001
From: yhirose <yuji.hirose.bug@gmail.com>
Date: Mon, 8 Mar 2021 11:54:46 -0500
Subject: [PATCH] Resolve #153

---
 README.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README.md b/README.md
index 65e341c..12d98a2 100644
--- a/README.md
+++ b/README.md
@@ -420,6 +420,8 @@ AST generation
 
 *cpp-peglib* is able to generate an AST (Abstract Syntax Tree) when parsing. `enable_ast` method on `peg::parser` class enables the feature.
 
+NOTE: An AST node holds a corresponding token as `std::string_vew` for performance and less memory usage. It is users' responsibility to kepp the original source text along with the generated AST tree.
+
 ```
 peg::parser parser(R"(
   ...