diff --git a/README.md b/README.md
index 7d583c8..80580a1 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # Header Injector
 
+[![CI](https://github.com/ryota-iso/header-injector/actions/workflows/ci.yml/badge.svg)](https://github.com/ryota-iso/header-injector/actions/workflows/ci.yml)
+
 WebExtension ベースの request header 付与ツール。
 
 主な用途: