diff --git a/.all-contributorsrc b/.all-contributorsrc
index a2cfd2a03..fa19cf391 100644
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@@ -291,6 +291,15 @@
         "code"
       ]
     },
+    {
+      "login": "leonmak",
+      "name": "Leon Mak",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/13071508?v=4",
+      "profile": "http://leonmak.me",
+      "contributions": [
+        "code"
+      ]
+    },
     {
       "login": "perwramdemark",
       "name": "Per Wramdemark",
diff --git a/README.md b/README.md
index 51c774275..abea00951 100644
--- a/README.md
+++ b/README.md
@@ -156,6 +156,9 @@ This project is licensed under the terms of the MIT license.
     <td align="center"><a href="https://github.com/AnaghaSasikumar"><img src="https://avatars2.githubusercontent.com/u/42939261?v=4" width="100px;" alt=""/><br /><sub><b>AnaghaSasikumar</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=AnaghaSasikumar" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/waisuan"><img src="https://avatars2.githubusercontent.com/u/10975700?v=4" width="100px;" alt=""/><br /><sub><b>Evan Sia Wai Suan</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=waisuan" title="Code">💻</a></td>
     <td align="center"><a href="http://www.wramdemark.se"><img src="https://avatars2.githubusercontent.com/u/7052193?v=4" width="100px;" alt=""/><br /><sub><b>Per Wramdemark</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=perwramdemark" title="Code">💻</a></td>
+    <td align="center"><a href="http://leonmak.me"><img src="https://avatars3.githubusercontent.com/u/13071508?v=4" width="100px;" alt=""/><br /><sub><b>Leon Mak</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=leonmak" title="Code">💻</a></td>
+  </tr>
+  <tr>
   </tr>
 </table>