diff --git a/ProblemMap/GlobalFixMap/MemoryLongContext/context-drift.md b/ProblemMap/GlobalFixMap/MemoryLongContext/context-drift.md
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--- a/ProblemMap/GlobalFixMap/MemoryLongContext/context-drift.md
+++ b/ProblemMap/GlobalFixMap/MemoryLongContext/context-drift.md
@@ -1,5 +1,22 @@
 # Context Drift — Long Reasoning Chain Instability
 
+<details>
+  <summary><strong>🧭 Quick Return to Map</strong></summary>
+
+<br>
+
+  > You are in a sub-page of **MemoryLongContext**.  
+  > To reorient, go back here:  
+  >
+  > - [**MemoryLongContext** — extended context windows and memory retention](./README.md)  
+  > - [**WFGY Global Fix Map** — main Emergency Room, 300+ structured fixes](../README.md)  
+  > - [**WFGY Problem Map 1.0** — 16 reproducible failure modes](../../README.md)  
+  >
+  > Think of this page as a desk within a ward.  
+  > If you need the full triage and all prescriptions, return to the Emergency Room lobby.
+</details>
+
+
 When reasoning spans 20–40 hops or more, attention shifts accumulate and context drifts.  
 This page explains how to diagnose λ divergence, stabilize reasoning chains, and repair collapsed context.