diff --git a/core/README.md b/core/README.md
index 4dbf5467..d5ae2ce1 100644
--- a/core/README.md
+++ b/core/README.md
@@ -169,6 +169,8 @@ export default Dome;
 
 Disable preview feature
 
+[![Open in CodeSandbox](https://img.shields.io/badge/Open%20in-CodeSandbox-blue?logo=codesandbox)](https://codesandbox.io/embed/react-markdown-editor-https-github.aaakk.us.kg-uiwjs-react-markdown-editor-issues-205-c3kqhd?fontsize=14&hidenavigation=1&theme=dark)
+
 ```jsx mdx:preview
 import React from "react";
 import MarkdownEditor from '@uiw/react-markdown-editor';