diff --git a/README.md b/README.md
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 # optuna-dashboard
 
+![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)
 ![tests](https://github.com/c-bata/optuna-dashboard/workflows/tests/badge.svg)
 
 Real-time dashboard for [Optuna](https://github.com/optuna/optuna).