diff --git a/.all-contributorsrc b/.all-contributorsrc
index 19fe79a38..ec0be565f 100644
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@@ -1924,6 +1924,15 @@
         "translation",
         "doc"
       ]
+    },
+    {
+      "login": "YichuanSun",
+      "name": "yiichan",
+      "avatar_url": "https://avatars.githubusercontent.com/u/30886176?v=4",
+      "profile": "https://github.com/YichuanSun",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,
diff --git a/README.md b/README.md
index ef3b0b904..91960ac3a 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=iluwatar_java-design-patterns&metric=coverage)](https://sonarcloud.io/dashboard?id=iluwatar_java-design-patterns)
 [![Join the chat at https://gitter.im/iluwatar/java-design-patterns](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/iluwatar/java-design-patterns?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-211-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-212-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 <br/>
@@ -348,6 +348,7 @@ This project is licensed under the terms of the MIT license.
     </tr>
     <tr>
       <td align="center"><a href="http://m-inh.github.io/"><img src="https://avatars.githubusercontent.com/u/10632233?v=4?s=100" width="100px;" alt="Minh Nguyen"/><br /><sub><b>Minh Nguyen</b></sub></a><br /><a href="#translation-m-inh" title="Translation">🌍</a> <a href="https://github.com/iluwatar/java-design-patterns/commits?author=m-inh" title="Documentation">📖</a></td>
+      <td align="center"><a href="https://github.com/YichuanSun"><img src="https://avatars.githubusercontent.com/u/30886176?v=4?s=100" width="100px;" alt="yiichan"/><br /><sub><b>yiichan</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=YichuanSun" title="Documentation">📖</a></td>
     </tr>
   </tbody>
 </table>