diff --git a/README.md b/README.md
index 603bc78..ee15a8c 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,9 @@ This is the robot code for DSST Cedar's robot in the 2023 BEST robotics competit
 
 ## Port mappings
 
-| Port | Motor             |
-| ---- | ----------------- |
-| 2    | Left drive motor  |
-| 3    | Right drive motor |
\ No newline at end of file
+| Port  | Motor               |
+| ----- | ------------------- |
+| 2     | Left drive motor    |
+| 3     | Right drive motor   |
+| 9     | Arm motor           |
+| UART1 | IR Sensor & Emitter |
\ No newline at end of file