diff --git a/ProblemMap/GlobalFixMap/Eval/eval_cost_reporting.md b/ProblemMap/GlobalFixMap/Eval/eval_cost_reporting.md
index f327095c..026bfbb8 100644
--- a/ProblemMap/GlobalFixMap/Eval/eval_cost_reporting.md
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@@ -1,5 +1,22 @@
 # Eval: Cost Reporting and Efficiency
 
+<details>
+  <summary><strong>🧭 Quick Return to Map</strong></summary>
+
+<br>
+
+  > You are in a sub-page of **Eval**.  
+  > To reorient, go back here:  
+  >
+  > - [**Eval** — model evaluation and benchmarking](./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>
+
+
 This page defines how to measure and report **cost per correct answer** in retrieval-augmented and reasoning pipelines. Latency and accuracy alone are insufficient. Without cost analysis, systems regress into wasteful configurations.
 
 ## Open these first