diff --git a/docs/README.md b/docs/README.md
index dac223e..40b0455 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -1,4 +1,5 @@
-[![GitHub issues](https://img.shields.io/github/issues/datawhalechina/easy-rl)](https://github.com/datawhalechina/easy-rl/issues) [![GitHub stars](https://img.shields.io/github/stars/datawhalechina/easy-rl)](https://github.com/datawhalechina/easy-rl/stargazers) [![GitHub forks](https://img.shields.io/github/forks/datawhalechina/easy-rl)](https://github.com/datawhalechina/easy-rl/network) [![Hits](https://hits.seeyoufarm.com/api/count/incr/badge.svg?url=https%3A%2F%2Fgithub.com%2Fdatawhalechina%2Feasy-rl%2F&count_bg=%2379C83D&title_bg=%23555555&icon=&icon_color=%23E7E7E7&title=hits&edge_flat=false)](https://hits.seeyoufarm.com) <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="知识共享许可协议" style="border-width:0" src="https://img.shields.io/badge/license-CC%20BY--NC--SA%204.0-lightgrey" /></a>
+[![GitHub issues](https://img.shields.io/github/issues/datawhalechina/easy-rl)](https://github.com/datawhalechina/easy-rl/issues) [![GitHub stars](https://img.shields.io/github/stars/datawhalechina/easy-rl)](https://github.com/datawhalechina/easy-rl/stargazers) [![GitHub forks](https://img.shields.io/github/forks/datawhalechina/easy-rl)](https://github.com/datawhalechina/easy-rl/network) [![Hits](https://hits.seeyoufarm.com/api/count/incr/badge.svg?url=https%3A%2F%2Fgithub.com%2Fdatawhalechina%2Feasy-rl%2F&count_bg=%2379C83D&title_bg=%23555555&icon=&icon_color=%23E7E7E7&title=hits&edge_flat=false)](https://hits.seeyoufarm.com) ![Downloads](https://img.shields.io/github/downloads/datawhalechina/easy-rl/total)
+<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="知识共享许可协议" style="border-width:0" src="https://img.shields.io/badge/license-CC%20BY--NC--SA%204.0-lightgrey" /></a>
 
 
 # 蘑菇书EasyRL