diff --git a/selfdrive/car/tests/test_fw_fingerprint.py b/selfdrive/car/tests/test_fw_fingerprint.py
index f5e88009df..b8258fc378 100755
--- a/selfdrive/car/tests/test_fw_fingerprint.py
+++ b/selfdrive/car/tests/test_fw_fingerprint.py
@@ -107,6 +107,7 @@ class TestFwFingerprint(unittest.TestCase):
           self.assertEqual(len(config.fuzzy_ecus), 0, "Cannot specify fuzzy ECUs without full config")
         else:
           self.assertGreater(len(config.fuzzy_ecus), 0, "Need to specify fuzzy ECUs")
+          # Assert every supported ECU FW version returns one platform code
           for platform, fw_by_addr in VERSIONS[brand].items():
             for addr, fws in fw_by_addr.items():
               if addr[0] in config.fuzzy_ecus: