diff --git a/hswaw/hacklock/hardware/hacklock-2137/README.md b/hswaw/hacklock/hardware/hacklock-2137/README.md
index c35fecdb..98f25d76 100644
--- a/hswaw/hacklock/hardware/hacklock-2137/README.md
+++ b/hswaw/hacklock/hardware/hacklock-2137/README.md
@@ -59,8 +59,8 @@ Pinout for UART2:
 
 | Function | GPIO |
 |----------|------|
-| UART2 TX (from hacklock) | 3 |
-| UART2 RX (to hacklock)   | 4 |
+| UART2 TX (from hacklock) | 4 |
+| UART2 RX (to hacklock)   | 5 |
 | UART2 5V enable | 7 |
 | UART2 RS232 enable | 9 |