diff --git a/contrib/libnfc/pn532_uart_on_rpi_3.conf.sample b/contrib/libnfc/pn532_uart_on_rpi_3.conf.sample
index 8b13789..ae969d7 100644
--- a/contrib/libnfc/pn532_uart_on_rpi_3.conf.sample
+++ b/contrib/libnfc/pn532_uart_on_rpi_3.conf.sample
@@ -1 +1,6 @@
+## Typical configuration file for PN532 device on R-Pi connected using UART
+## Note: to use UART port on R-Pi, you have to disable linux serial console:
+##   http://learn.adafruit.com/adafruit-nfc-rfid-on-raspberry-pi/freeing-uart-on-the-pi
+name = "PN532 board via UART"
+connstring = pn532_uart:/dev/ttyS0