diff --git a/backend/wrangler.jsonc b/backend/wrangler.jsonc
index 3ca8342..0f41ee6 100644
--- a/backend/wrangler.jsonc
+++ b/backend/wrangler.jsonc
@@ -4,6 +4,7 @@
   "main": "src/index.ts",
   "compatibility_date": "2026-10-01",
   "account_id": "94480614a6df7731f1e4491bdac5c440",
+  "routes": [{ "pattern": "chat.dalestudy.com", "custom_domain": true }],
   "build": {
     "command": "npm --prefix ../frontend ci && npm --prefix ../frontend run build"
   },