diff --git a/.all-contributorsrc b/.all-contributorsrc
index 2f6cd73..f2446f1 100644
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@@ -2676,6 +2676,15 @@
       "contributions": [
         "content"
       ]
+    },
+    {
+      "login": "kazu728",
+      "name": "Kazuki Matsuo",
+      "avatar_url": "https://avatars.githubusercontent.com/u/34614358?v=4",
+      "profile": "https://github.com/kazu728",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 8,
diff --git a/AUTHORS.md b/AUTHORS.md
index 5515745..00122e0 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -377,6 +377,7 @@ authors.
       <td align="center" valign="top" width="12.5%"><a href="https://github.com/parnavh"><img src="https://avatars.githubusercontent.com/u/45985534?v=4?s=100" width="100px;" alt="Parnav Harinathan"/><br /><sub><b>Parnav Harinathan</b></sub></a><br /><a href="#content-parnavh" title="Content">🖋</a></td>
       <td align="center" valign="top" width="12.5%"><a href="https://github.com/0Ahmed-0"><img src="https://avatars.githubusercontent.com/u/111569638?v=4?s=100" width="100px;" alt="0Ahmed-0"/><br /><sub><b>0Ahmed-0</b></sub></a><br /><a href="#content-0Ahmed-0" title="Content">🖋</a></td>
       <td align="center" valign="top" width="12.5%"><a href="https://github.com/guizo792"><img src="https://avatars.githubusercontent.com/u/95940388?v=4?s=100" width="100px;" alt="guizo792"/><br /><sub><b>guizo792</b></sub></a><br /><a href="#content-guizo792" title="Content">🖋</a></td>
+      <td align="center" valign="top" width="12.5%"><a href="https://github.com/kazu728"><img src="https://avatars.githubusercontent.com/u/34614358?v=4?s=100" width="100px;" alt="Kazuki Matsuo"/><br /><sub><b>Kazuki Matsuo</b></sub></a><br /><a href="https://github.com/rust-lang/rustlings/commits?author=kazu728" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>