diff --git a/docs/v3.md b/docs/v3.md
index 1e0c1c6c..872ff4c6 100644
--- a/docs/v3.md
+++ b/docs/v3.md
@@ -156,7 +156,7 @@ To manage the power of your computer, you will need to install an ATX adapter bo
     3. **SPI and GPIO** for the custom extension boards.
     4. **Audio capture** jumpers. Connects I2S pins 18, 19, 20 to HDMI capture chip.
     5. **UART access** jumpers. Connects GPIO 14 and 15 to the RJ-45 and USB console ports.
-    6. **Serial console port** (default: /dev/ttyAMA0, RS232 input, outputs +6V/-6V, for the Raspberry Pi or server console access).
+    6. **Serial console port** (default: /dev/ttyAMA0, RS232 input, outputs +6V/-6V, for the Raspberry Pi or server console access, use the [Cisco/Mikrotik-style](https://wiki.mikrotik.com/wiki/File:Rj45-pinout.gif.png) cable).
     7. **USB-C console port** (shared with #6 above, takes priority over RJ45).
     8. **Power** and **activity LEDs**. On the left of the LEDs the watchdog jumper is located. Don't touch it.
     9. **USB-C power input**.