diff --git a/tests/test_audit_regressions.py b/tests/test_audit_regressions.py
index d697062c4..35cecba97 100644
--- a/tests/test_audit_regressions.py
+++ b/tests/test_audit_regressions.py
@@ -6284,7 +6284,13 @@ class DocsDescribeTheRegistriesTheyName(unittest.TestCase):
         from dedup import NODEDUP_DIRS
         tools = (ROOT / "wiki" / "tools.md").read_text(encoding="utf-8")
         line = next(l for l in tools.splitlines() if "NODEDUP_DIRS" in l)
-        self.assertEqual(sorted(d for d in NODEDUP_DIRS if d not in line), [])
+        # Compared as list items: `mame` was missing while the substring
+        # test found it in `_mame_clones.json` on the same line.
+        listed = line.split("`NODEDUP_DIRS`", 1)[1].split(":", 1)[1].rstrip(" |")
+        self.assertEqual(
+            sorted(item.strip() for item in listed.split(",")),
+            sorted(NODEDUP_DIRS),
+        )
         readme_gen = (ROOT / "scripts" / "generate_readme.py").read_text(encoding="utf-8")
         self.assertIn("NODEDUP_DIRS", readme_gen)
 
diff --git a/wiki/tools.md b/wiki/tools.md
index 9d9c2d08a..93b044523 100644
--- a/wiki/tools.md
+++ b/wiki/tools.md
@@ -1325,7 +1325,7 @@ before a release (wiki/release-process.md). Its lines stay in
 | Script | Purpose |
 |--------|---------|
 | `common.py` | Shared library: hash computation, file resolution, platform config loading, emulator profiles, target filtering |
-| `dedup.py` | Deduplicate `bios/` (`--dry-run`, `--bios-dir`): byte-identical copies are deleted and one kept. Identical MAME sets under other names stay one file, named in `_mame_clones.json`. Trees addressed by path are left alone (`NODEDUP_DIRS`): BBK, Bungie, C-Dogs SDL, Ikemen GO, PinMAME, RPG Maker, ScummVM, Softdisk, TheXTech, splitwolf, Theme Hospital, c64-emu, opentyrian, tzdata |
+| `dedup.py` | Deduplicate `bios/` (`--dry-run`, `--bios-dir`): byte-identical copies are deleted and one kept. Identical MAME sets under other names stay one file, named in `_mame_clones.json`. Trees addressed by path are left alone (`NODEDUP_DIRS`), under a folder of that name at any depth: BBK, Bungie, C-Dogs SDL, Ikemen GO, mame, PinMAME, RPG Maker, ScummVM, Softdisk, TheXTech, splitwolf, Theme Hospital, c64-emu, opentyrian, tzdata |
 | `identity.py` | One content filed under two identities: groups `bios/` by content and reports a group that crosses manufacturers outside `KNOWN_SHARED` (`--strict` exits 1, pipeline step 3a) |
 | `slots.py` | Destinations the platform and a core both claim, and how the pack settles each (`--platform`, `--include-archived`, `--target`, `--json`, `--strict`, and pipeline step 3b passes the run's own `--include-archived` and `--target`) |
 | `region_audit.py` | Confront every profile `region:` with the regions No-Intro names for the same dump (`--json`, `--db`, `--emulators-dir`). An opinion, never an authority: the code decides, and a disagreement is a line to read in the emulator's source |