diff --git a/selfdrive/car/fw_query_definitions.py b/selfdrive/car/fw_query_definitions.py
index 59e57e5f1f..1d6104574e 100755
--- a/selfdrive/car/fw_query_definitions.py
+++ b/selfdrive/car/fw_query_definitions.py
@@ -14,6 +14,7 @@ EcuAddrSubAddr = Tuple[int, int, Optional[int]]
 LiveFwVersions = Dict[AddrType, Set[bytes]]
 OfflineFwVersions = Dict[str, Dict[EcuAddrSubAddr, List[bytes]]]
 
+# A global list of addresses we will only ever consider for VIN responses
 STANDARD_VIN_ADDRS = [0x7e0, 0x7e2, 0x760, 0x18da10f1, 0x18da0ef1]  # engine, hybrid controller, Ford abs, 29-bit engine, PGM-FI