diff --git a/README.md b/README.md
index e8c0338..8b115dd 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 # `array<T>`
 A JavaScript + Python like array in C++.
 
+[![CMake](https://github.com/iwatakeshi/array/actions/workflows/cmake-single-platform.yml/badge.svg)](https://github.com/iwatakeshi/array/actions/workflows/cmake-single-platform.yml)
+
 ## Build Instructions
 
 This project uses CMake as its build system. A Makefile is provided for convenience to simplify the build process.
@@ -180,4 +182,4 @@ int main() {
 
   return 0;
 }
-```
\ No newline at end of file
+```