diff --git a/emulators/mame2010.yml b/emulators/mame2010.yml
index 26b15b78..6bdcea20 100644
--- a/emulators/mame2010.yml
+++ b/emulators/mame2010.yml
@@ -58,6 +58,13 @@ systems:
   - imax-macs
   - arcade
   - barcrest-mpu4
+  - capcom-zn1
+  - capcom-zn2
+  - konami-gv
+  - super-kaneko-nova
+  - alg-laserdisc
+  - exidy-maxaflex
+  - hyper-neogeo64
 
 notes: |
   Frozen snapshot of MAME 0.139 (mid-2010). Sourced from mame0139s.zip.
diff --git a/scripts/validate_schemas.py b/scripts/validate_schemas.py
index 0346cee9..c968d30b 100644
--- a/scripts/validate_schemas.py
+++ b/scripts/validate_schemas.py
@@ -74,7 +74,7 @@ _CHECK_FIELDS = {
 
 
 def _systems_outside_profile(path: Path, document: object) -> list[str]:
-    """An entry's systems: naming a system its profile does not list.
+    """An entry's system: or systems: naming a system its profile does not list.
 
     A --system pick selects the profile by its systems: and then the entry
     by its own, so a name the profile lacks is one no pick ever reaches.
@@ -86,11 +86,13 @@ def _systems_outside_profile(path: Path, document: object) -> list[str]:
     for index, entry in enumerate(document.get("files") or []):
         if not isinstance(entry, dict):
             continue
-        unknown = [str(s) for s in entry.get("systems") or [] if str(s) not in listed]
+        named = [entry["system"]] if entry.get("system") else []
+        named += list(entry.get("systems") or [])
+        unknown = [str(s) for s in named if str(s) not in listed]
         if unknown:
             out.append(
                 f"{path.relative_to(ROOT)}: files[{index}] ({entry.get('name')}) "
-                f"systems {', '.join(unknown)} not in the profile's systems"
+                f"system {', '.join(unknown)} not in the profile's systems"
             )
     return out
 
diff --git a/tests/test_mame_devices.py b/tests/test_mame_devices.py
index 60898895..2e679f98 100644
--- a/tests/test_mame_devices.py
+++ b/tests/test_mame_devices.py
@@ -622,7 +622,15 @@ class APickReadsTheEntrySystems(unittest.TestCase):
         outside = {**base, "files": [{"name": "x.zip", "systems": ["a", "c"]}]}
         found = validate_schemas._systems_outside_profile(root / "emulators" / "x.yml", outside)
         self.assertEqual(len(found), 1)
-        self.assertIn("systems c", found[0])
+        self.assertIn("system c", found[0])
+        single = {**base, "files": [{"name": "x.zip", "system": "c"}]}
+        found = validate_schemas._systems_outside_profile(root / "emulators" / "x.yml", single)
+        self.assertEqual(len(found), 1)
+        self.assertIn("system c", found[0])
+        listed = {**base, "files": [{"name": "x.zip", "system": "a"}]}
+        self.assertEqual(
+            validate_schemas._systems_outside_profile(root / "emulators" / "x.yml", listed), []
+        )
 
 
 class Cli(unittest.TestCase):