diff --git a/README.md b/README.md
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 [![Gem Version](https://badge.fury.io/rb/slim-embedded-minify.svg)](https://badge.fury.io/rb/slim-embedded-minify)
 [![test](https://github.com/ydah/slim-embedded-minify/actions/workflows/minitest.yml/badge.svg)](https://github.com/ydah/slim-embedded-minify/actions/workflows/minitest.yml)
+[![RubyDoc](https://img.shields.io/badge/%F0%9F%93%9ARubyDoc-documentation-informational.svg)](https://www.rubydoc.info/gems/slim-embedded-minify)
 
 A slim file to minify embedded code.