diff --git a/README.md b/README.md
index ec76d11..8ede02f 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,19 @@ This library is a collection of common functionality for other M5Libraries and p
 ## UnitTest (For internal maintainers)
 UnitTest is included, which can run on PlatformIO.
 
-### Required Libraries for UnitTest
-- M5Unified
-- googleTest@1.12.1
+## Doxygen document
+If you want to generate documents on your local machine, execute the following command
+
+```
+bash docs/doxy.sh
+```
+
+It will output it under docs/html  
+If you want to output Git commit hashes to html, do it for the git cloned folder.
+
+### Required
+- [Doxyegn](https://www.doxygen.nl/)
+- [pcregrep](https://formulae.brew.sh/formula/pcre2)
+- [Git](https://git-scm.com/) (Output commit hash to html)
+