diff --git a/.all-contributorsrc b/.all-contributorsrc
index be89629a9..fbcae0726 100644
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@@ -605,6 +605,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "ariostas",
+      "name": "Andres Rios Tascon",
+      "avatar_url": "https://avatars.githubusercontent.com/u/7596837?v=4",
+      "profile": "http://www.ariostas.com",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,
diff --git a/README.md b/README.md
index efc43b192..e634a4ec1 100644
--- a/README.md
+++ b/README.md
@@ -193,6 +193,7 @@ Thanks especially to the gracious help of Uproot contributors (including the [or
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/MatousVozak"><img src="https://avatars.githubusercontent.com/u/33348191?v=4?s=100" width="100px;" alt="MatousVozak"/><br /><sub><b>MatousVozak</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=MatousVozak" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/rossodisera"><img src="https://avatars.githubusercontent.com/u/46961664?v=4?s=100" width="100px;" alt="Andrea Serafini"/><br /><sub><b>Andrea Serafini</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=rossodisera" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="http://www.ariostas.com"><img src="https://avatars.githubusercontent.com/u/7596837?v=4?s=100" width="100px;" alt="Andres Rios Tascon"/><br /><sub><b>Andres Rios Tascon</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=ariostas" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>