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README.md

@@ -60,6 +60,7 @@ Top-level repository structure:
 │   ├── external_source_catalog.md
 │   ├── naming_spec.md
 │   ├── placement_asset_notes.md
+│   ├── structure_mapping.md
 │   ├── source_notes/
 │   └── storage_spec.md
 ├── manifest/
@@ -97,6 +98,7 @@ Placement-related notes and candidate external links are tracked in:
 docs/asset_readiness_classification.md
 docs/external_source_catalog.md
 docs/placement_asset_notes.md
+docs/structure_mapping.md
 docs/source_notes/third_party.md
 ```