diff --git a/.all-contributorsrc b/.all-contributorsrc
index 83764d0c24b4..820760be6d2d 100644
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@@ -2541,6 +2541,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "tiennm99",
+      "name": "Tien Nguyen Minh",
+      "avatar_url": "https://avatars.githubusercontent.com/u/39063457?v=4",
+      "profile": "http://miti99.dev",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,
diff --git a/README.md b/README.md
index 0fa0fb79a687..661cb971e068 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-279-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-280-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 <br/>
@@ -433,6 +433,7 @@ This project is licensed under the terms of the MIT license.
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/saif7159"><img src="https://avatars.githubusercontent.com/u/36008396?v=4?s=100" width="100px;" alt="Saiful Haque"/><br /><sub><b>Saiful Haque</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=saif7159" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/JabezBrew"><img src="https://avatars.githubusercontent.com/u/74483609?v=4?s=100" width="100px;" alt="JabezBrew"/><br /><sub><b>JabezBrew</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=JabezBrew" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/konstantin-goldman"><img src="https://avatars.githubusercontent.com/u/47669472?v=4?s=100" width="100px;" alt="konstantin-goldman"/><br /><sub><b>konstantin-goldman</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=konstantin-goldman" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="http://miti99.dev"><img src="https://avatars.githubusercontent.com/u/39063457?v=4?s=100" width="100px;" alt="Tien Nguyen Minh"/><br /><sub><b>Tien Nguyen Minh</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=tiennm99" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>