diff --git a/selfdrive/car/README.MD b/selfdrive/car/README.MD
index 553d85ff6..244757c13 100644
--- a/selfdrive/car/README.MD
+++ b/selfdrive/car/README.MD
@@ -1,5 +1,11 @@
-interace.py: Generic interface to send and receive messages from CAN (controlsd uses this to communicate with car)
-carcontroller.py: Builds CAN messages to send to car
-carstate.py : Reads CAN from car and builds openpilot CarState message
-values.py : Fingerprints and absolute limits
-radar_interface.py : Radar interface
+## Port structure
+##### interace.py
+Generic interface to send and receive messages from CAN (controlsd uses this to communicate with car)
+##### carcontroller.py
+Builds CAN messages to send to car
+##### carstate.py
+Reads CAN from car and builds openpilot CarState message
+##### values.py
+Fingerprints and absolute limits
+##### radar_interface.py
+Radar interface