diff --git a/domains/api.katidoki.json b/domains/api.katidoki.json
new file mode 100644
index 000000000..54be96678
--- /dev/null
+++ b/domains/api.katidoki.json
@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "hitoshi-okada",
+    "email": "okada@katidoki.com"
+  },
+  "record": {
+    "CNAME": "hitoshi-okada.github.io"
+  }
+}