diff --git a/.doc/system-design/README.md b/.doc/system-design/README.md
index 3dd22376..9ff28446 100644
--- a/.doc/system-design/README.md
+++ b/.doc/system-design/README.md
@@ -209,6 +209,7 @@
     ├── 05-Phase0-基线确认与契约冻结.md
     └── 06-Phase7-全链路验收与发布基线.md
 ├── 2026-09-14-module-decoupling-architecture.md     ← 模块化单体解耦
+├── 2026-09-20-module-development-standards.md       ← 开发者入口：契约 / 接口 / 故障隔离
 
 .tmp/                                                ← 中间分析文件
 ├── intent-recognition/