diff --git a/selfdrive/car/tests/test_models.py b/selfdrive/car/tests/test_models.py
index d9ac3f0b1b..ed6726b54e 100755
--- a/selfdrive/car/tests/test_models.py
+++ b/selfdrive/car/tests/test_models.py
@@ -221,8 +221,8 @@ class TestCarModelBase(unittest.TestCase):
     RI = RadarInterface(self.CP)
     assert RI
 
-    # Since OBD port is multiplexed while fingerprinting, start parsing CAN messages
-    # after we've left ELM mode
+    # Since OBD port is multiplexed to bus 1 (commonly radar bus) while fingerprinting,
+    # start parsing CAN messages after we've left ELM mode
     error_cnt = 0
     for i, msg in enumerate(self.can_msgs[self.elm_frame:]):
       rr = RI.update((msg.as_builder().to_bytes(),))