diff --git a/readme.md b/readme.md
index 93f001d..94f2038 100644
--- a/readme.md
+++ b/readme.md
@@ -5,6 +5,7 @@
 ![GitHub License](https://img.shields.io/github/license/orange-cpp/omath)
 ![GitHub contributors](https://img.shields.io/github/contributors/orange-cpp/omath)
 ![GitHub top language](https://img.shields.io/github/languages/top/orange-cpp/omath)
+[![CodeFactor](https://www.codefactor.io/repository/github/orange-cpp/omath/badge)](https://www.codefactor.io/repository/github/orange-cpp/omath)
 ![GitHub forks](https://img.shields.io/github/forks/orange-cpp/omath)
 </div>