diff --git a/README.md b/README.md
index fa3b5d9..87b6b97 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,7 @@ Pin 	Color	Use	ArduinoPin	Raspberry Pi 4 B Pin
 3	White	Left	D0		 3 GPIO2 (Orange)
 4	Blue	Up	D2		 8 GPIO14
 5	Brown	Down	D1		 5 GPIO3
-6	Red	GND	GND under ICSP	 7 GND
+6	Red	GND	GND under ICSP	 7 GND XXX 9?
 7	Yellow	Speed	? PWM		12 GPIO18
 ```
 
@@ -75,7 +75,7 @@ PIN	Color	Use	Raspberry Pi 4 B Pin
 3	Brown	Left	 3 GPIO2
 4	Yellow	Up	 8 GPIO14
 5	Red	Down	 5 GPIO3
-6	Blue	GND	 7 GND
+6	Blue	GND	 9 GND
 7	Black	Speed	12 GPIO18
 ```