diff --git a/Simple-ESPSomfy-RTS-device.md b/Simple-ESPSomfy-RTS-device.md
index 23cdece..f8483d6 100644
--- a/Simple-ESPSomfy-RTS-device.md
+++ b/Simple-ESPSomfy-RTS-device.md
@@ -156,7 +156,7 @@ This is an interesting little board in that it it seems to have quite a few more
 | --- | ----------- | ------- |
 | 1 | GND | GND |
 | 2 | VCC | 3v3 |
-| 3 | GDO0 - This is the TX Pin | GPIO 33 |
+| 3 | GDO0 - This is the TX Pin | GPIO 04 |
 | 4 | CSN | GPIO 05 |
 | 5 | SCK | GPIO 18 |
 | 6 | MOSI | GPIO 13 |