diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@
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+[![All Contributors](https://img.shields.io/badge/all_contributors-122-orange.svg?style=flat-square)](#contributors-)
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 # Introduction
@@ -250,6 +250,7 @@ This project is licensed under the terms of the MIT license.
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     <td align="center"><a href="https://www.linkedin.com/in/ashish-trivedi-218379135/"><img src="https://avatars3.githubusercontent.com/u/23194128?v=4" width="100px;" alt=""/><br /><sub><b>Ashish Trivedi</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ashishtrivedi16" title="Code">💻</a></td>
+    <td align="center"><a href="https://rayyounghong.com"><img src="https://avatars1.githubusercontent.com/u/41055099?v=4" width="100px;" alt=""/><br /><sub><b>洪月阳</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=RayYH" title="Code">💻</a></td>
   </tr>
 </table>