diff --git a/.all-contributorsrc b/.all-contributorsrc
index 68ef5fc1..d36e5f22 100644
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@@ -322,6 +322,15 @@
         "code",
         "doc"
       ]
+    },
+    {
+      "login": "marioleed",
+      "name": "Mario Sannum",
+      "avatar_url": "https://avatars.githubusercontent.com/u/1763448?v=4",
+      "profile": "https://github.com/marioleed",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "repoHost": "https://github.com",
diff --git a/README.md b/README.md
index 16bdc4ba..e759c33f 100644
--- a/README.md
+++ b/README.md
@@ -214,6 +214,7 @@ Thanks goes to these wonderful people
     <td align="center"><a href="https://github.com/0xnoob"><img src="https://avatars.githubusercontent.com/u/49793844?v=4?s=100" width="100px;" alt=""/><br /><sub><b>0xnoob</b></sub></a><br /><a href="https://github.com/kentcdodds/advanced-react-patterns/commits?author=0xnoob" title="Code">💻</a></td>
     <td align="center"><a href="http://pavlos.dev"><img src="https://avatars.githubusercontent.com/u/100233?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Pavlos Vinieratos</b></sub></a><br /><a href="https://github.com/kentcdodds/advanced-react-patterns/commits?author=pvinis" title="Documentation">📖</a></td>
     <td align="center"><a href="https://github.com/infoxicator"><img src="https://avatars.githubusercontent.com/u/17012976?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ruben Casas</b></sub></a><br /><a href="https://github.com/kentcdodds/advanced-react-patterns/commits?author=infoxicator" title="Code">💻</a> <a href="https://github.com/kentcdodds/advanced-react-patterns/commits?author=infoxicator" title="Documentation">📖</a></td>
+    <td align="center"><a href="https://github.com/marioleed"><img src="https://avatars.githubusercontent.com/u/1763448?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Mario Sannum</b></sub></a><br /><a href="https://github.com/kentcdodds/advanced-react-patterns/commits?author=marioleed" title="Code">💻</a></td>
   </tr>
 </table>