diff --git a/source/_components/rflink.markdown b/source/_components/rflink.markdown
index e33633485f4..ff64c8cf84d 100644
--- a/source/_components/rflink.markdown
+++ b/source/_components/rflink.markdown
@@ -12,7 +12,7 @@ ha_category: Hub
 ha_release: 0.38
 ---
 
-The `rflink` component support devices that use [Rflink gateway firmware](http://www.nemcon.nl/blog2/), for example the [Nodo Rflink Gateway](https://www.nodo-shop.nl/nl/21-rflink-gateway). Rflink gateway is an Arduino firmware that allows communication with 433 Mhz devices using cheap hardware (Arduino + 433 Mhz tranceiver).
+The `rflink` component support devices that use [Rflink gateway firmware](http://www.nemcon.nl/blog2/), for example the [Nodo Rflink Gateway](https://www.nodo-shop.nl/nl/21-rflink-gateway). Rflink gateway is firmware for the Arduino MEGA 2560 that allows communication with 433 Mhz devices using cheap hardware (Arduino + 433 Mhz tranceiver).
 
 The 433 Mhz spectrum is used by many manufacturers mostly using their own protocol/standard and includes devices like: light switches, blinds, weather stations, alarms and various other sensors.
 
@@ -60,7 +60,17 @@ To expose the usb/serial interface over TCP on a different host (Linux) the foll
 $ socat /dev/ttyACM0,b57600 TCP-LISTEN:1234,reuseaddr
 ```
 
-Other methods of exposing the serial interface over TCP are possible (eg: ESP8266 or using Arduino Wifi shield). Basically the serial stream should be directly mapped to the TCP stream.
+Other methods of exposing the serial interface over TCP are possible (eg: ESP8266 or using Arduino Wifi shield). Essentially the serial stream should be directly mapped to the TCP stream.
+
+Tested with Wifi serial bridge [esp-link V2.2.3](https://github.com/jeelabs/esp-link/releases/tag/v2.2.3) running on a NodeMCU (ESP8266 Wifi module) with ESP8266 TXD0 (pin D10) and RXD0 (pin D9) connected to Arduino MEGA 2560 RX (Pin 2) and TX (Pin 3) respectively. 
+
+<p class='note warning'>
+Due to different logical levels, a voltage level shifter is required between the 3.3V NodeMCU and 5V Arduino MEGA 2560 pins.
+</p>
+
+<p class='note'>
+When re-flashing the Arduino MEGA, disconnect the ESP8266 to avoid programming difficulties.
+</p>
 
 ```yaml
 # Example configuration.yaml entry