diff --git a/.all-contributorsrc b/.all-contributorsrc
index 6d5d05f..8ad1bf3 100644
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@@ -143,6 +143,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "takasumasakazu",
+      "name": "TAKASU Masakazu",
+      "avatar_url": "https://avatars.githubusercontent.com/u/1667148?v=4",
+      "profile": "https://medium.com/@tks/takasu-profile-c50feee078ac",
+      "contributions": [
+        "promotion"
+      ]
     }
   ],
   "contributorsPerLine": 7,