diff --git a/hardware/mux_rpi/README.md b/hardware/mux_rpi/README.md
index f4a339c..e05c62d 100644
--- a/hardware/mux_rpi/README.md
+++ b/hardware/mux_rpi/README.md
@@ -26,7 +26,7 @@ This build is ```i2c``` focused for additional parts. Please hookup using standa
 
 | Raspberry Pi Header Pin | Arduino Pin |
 | ----------------------- | ----------- |
-| 6 | Gnd |
+| 39 | Gnd |
 | 8 (TX) | D11 (RX) |
 | 10 (RX) | D10 (TX) |
 | 32 (TX) | MISO (RX) |