diff --git a/WiFi-Installation-(english).md b/WiFi-Installation-(english).md
index bdb4c59..0684de7 100644
--- a/WiFi-Installation-(english).md
+++ b/WiFi-Installation-(english).md
@@ -52,6 +52,12 @@ If you want, you can now attach the circuit board to the housing. I used one of
 
 [[/images/ESP_05.jpg | width = 800px]]
 
+## Enable wifi in firmware
+
+In order to be able to use the WLAN functionality, it must first be activated in the firmware. To do this, the two lines `SERIAL_PORT_2` and `BAUDRATE_2` must be commented out, as can be seen in the screenshot. Only then is the preconfigured second port active and communication with the WLAN module works.
+
+[[ /images/ESP_Firmware_Enable.jpg | width = 800px ]]
+
 ## ESP firmware flashing
 
 To flash the firmware, we connect the ESP01 to the ESP programmer and plug it into a free USB port. We also download the [ESP3D firmware for the ESP01 module](https://github.com/knutwurst/ESP3D/releases).