diff --git a/esp32_device/README.md b/esp32_device/README.md
index 65e460c..3607c0b 100755
--- a/esp32_device/README.md
+++ b/esp32_device/README.md
@@ -2,6 +2,11 @@
 
 ESP32 client device, using `W32-ETH01` device
 
+## Pins for relays
+The pins are the following (in the order of definition): 4, 14, 15, 2
+
+**WARNING!** The Pin 2 MUST be disconnect to reflash the card!
+
 ## Some commands
 
 Create a new firmware build:
diff --git a/esp32_device/main/relays.c b/esp32_device/main/relays.c
index 52d8855..1cc93fb 100644
--- a/esp32_device/main/relays.c
+++ b/esp32_device/main/relays.c
@@ -9,7 +9,7 @@ static const char *TAG = "relays";
 /**
  * Device relays GPIO ids
  */
-static int DEVICE_GPIO_IDS[3] = {4, 14, 15};
+static int DEVICE_GPIO_IDS[4] = {4, 14, 15, 2};
 
 int relays_count()
 {