diff --git a/CLAUDE.md b/CLAUDE.md
index 86e8ab9..b3aaad0 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -113,16 +113,36 @@ IPX/TCP → nwtransport → nwconn (dispatcher) → NCP providers
 
 ### Original NSS reference sources
 
-The original NSS sources are available on the host at `/home/mario/mars/nss`:
+The complete original NSS source tree is at `/home/mario/mars/nss`:
 
 ```
-/home/mario/mars/nss/public_core/   — comn, nss, library, lsa, manage, ndpmod, nebdrv, sharedsrc, …
-/home/mario/mars/nss/shared/sdk/    — include, internal, public, comnSA headers
+/home/mario/mars/nss/
+├── Makefile                        — top-level build entry point
+├── buildtools/                     — build helper scripts and tools
+├── docs/                           — NSS documentation
+├── public_core/                    — NSS C sources
+│   ├── Makefile
+│   ├── admindrv/   admindrvModules.mk
+│   ├── comn/       comnModules.mk      ← namespace, beast, common, compression, …
+│   ├── library/    libraryModules.mk   ← stdio, wio, OS helpers, …
+│   ├── lsa/        lsaModules.mk
+│   ├── manage/     manageModules.mk
+│   ├── ndpmod/     ndpmodModules.mk
+│   ├── nebdrv/     nebdrvModules.mk
+│   ├── nss/        nssModules.mk
+│   ├── nsslnxlib/  nsslnxlibModules.mk
+│   ├── nwraid/     nwraidModules.mk
+│   ├── sharedsrc/                  — shared .c.h source fragments
+│   └── zlss/       zlssModules.mk
+└── shared/
+    ├── sdk/                        — include/, internal/, public/, comnSA/ headers
+    ├── schema/
+    └── support/
 ```
 
-Use these directly for comparison when importing or auditing files into
-`src/nwnss/` and `include/nwnss/`.  The provenance mapping is in the section
-below.
+The `*Modules.mk` files list the exact object files each subsystem builds —
+use them to find the authoritative source set for any subsystem before
+importing or auditing files into `src/nwnss/` and `include/nwnss/`.
 
 ### NSS import layout