diff --git a/ProblemMap/GlobalFixMap/Cloud_Serverless/README.md b/ProblemMap/GlobalFixMap/Cloud_Serverless/README.md
index f6295199..77dc20c8 100644
--- a/ProblemMap/GlobalFixMap/Cloud_Serverless/README.md
+++ b/ProblemMap/GlobalFixMap/Cloud_Serverless/README.md
@@ -1,5 +1,20 @@
 # Cloud & Serverless — Guardrails and Fix Patterns
 
+<details>
+  <summary><strong>🏥 Quick Return to Emergency Room</strong></summary>
+
+<br>
+
+  > You are in a specialist desk.  
+  > For full triage and doctors on duty, return here:  
+  > 
+  > - [**WFGY Global Fix Map** — main Emergency Room, 300+ structured fixes](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/README.md)  
+  > - [**WFGY Problem Map 1.0** — 16 reproducible failure modes](https://github.com/onestardao/WFGY/blob/main/ProblemMap/README.md)  
+  > 
+  > Think of this page as a sub-room.  
+  > If you want full consultation and prescriptions, go back to the Emergency Room lobby.
+</details>
+
 A compact hub to harden serverless and edge workloads without touching your core infra.  
 Targets Vercel, Cloudflare Workers, Lambda, Cloud Run, Azure Functions, Fly.io, and similar stacks.  
 Each symptom maps to an auditable WFGY fix page with measurable acceptance.