diff --git a/README.md b/README.md
index 7bc596d..1d5db8f 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 
 [![MIT License](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/LeetCode-in-Net/LeetCode-in-Net/blob/main/LICENSE)
 [![Dotnet CI](https://github.com/LeetCode-in-Net/LeetCode-in-Net/actions/workflows/dotnet-desktop.yml/badge.svg)](https://github.com/LeetCode-in-Net/LeetCode-in-Net/actions/workflows/dotnet-desktop.yml)
+[![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=LeetCode-in-Net_LeetCode-in-Net&metric=sqale_rating)](https://sonarcloud.io/summary/new_code?id=LeetCode-in-Net_LeetCode-in-Net)
 [![](https://img.shields.io/github/stars/LeetCode-in-Net/LeetCode-in-Net?style=flat-square)](https://github.com/LeetCode-in-Net/LeetCode-in-Net)
 [![](https://img.shields.io/github/forks/LeetCode-in-Net/LeetCode-in-Net?style=flat-square)](https://github.com/LeetCode-in-Net/LeetCode-in-Net/fork)