diff --git a/platformio_override.ini b/platformio_override.ini
index e7391dc8..ccf4d2e7 100644
--- a/platformio_override.ini
+++ b/platformio_override.ini
@@ -11,6 +11,9 @@
 
 [env]
 ; Specify port here. Comment out (add ; in front of line) to use auto detection.
+; Under Linux, the ports are in the format /dev/tty***, typically /dev/ttyUSB0
+; To look up the port, execute ls /dev/tty*, then connect the device
+; then execute ls /dev/tty* again and check which device was added
 monitor_port = COM4
 upload_port = COM4