diff --git a/backend/llm.txt b/backend/llm.txt
index 63ba9c9..f7c8b51 100644
--- a/backend/llm.txt
+++ b/backend/llm.txt
@@ -19,6 +19,7 @@ This file condenses `backend/docs/dev/http_api.md` + `backend/docs/dev/model.md`
 - DO NOT manually write provider declarations (only `atomctl gen provider`).
 - DO NOT manually write route declarations (only `atomctl gen route`).
 - DO keep Swagger annotations consistent with actual Fiber route paths (including `:param`).
+- MUST: route path parameter placeholders MUST be `camelCase` (e.g. `:tenantCode`), never `snake_case` (e.g. `:tenant_code`).
 
 ---
 
@@ -133,6 +134,7 @@ Models live in:
 
 - No explicit `BEGIN/COMMIT` needed (framework handles).
 - Table name should be plural (e.g. `tenants`).
+- MUST: when writing migration content, every field/column MUST include a brief Chinese remark, and also include commented details for that field’s usage scenario and rules/constraints (e.g., valid range/format, default behavior, special cases).
 
 3) Apply migration: