diff --git a/Using-SoapySDR-via-rx_tools-with-OpenWebRX.md b/Using-SoapySDR-via-rx_tools-with-OpenWebRX.md
index 8e1907d..71128c7 100644
--- a/Using-SoapySDR-via-rx_tools-with-OpenWebRX.md
+++ b/Using-SoapySDR-via-rx_tools-with-OpenWebRX.md
@@ -91,7 +91,8 @@ You can terminate it by pressing <kbd>Ctrl</kbd>+<kbd>C</kbd> multiple times, or
 ## Step #4: Edit OpenWebRX configuration 
 Uncomment the corresponding lines in `config_webrx.py`:
 ```python
-start_rtl_command="rx_sdr -F CF32 -s {samp_rate} -f {center_freq} -p {ppm} -g {rf_gain} -".format(rf_gain=rf_gain, center_freq=center_freq, samp_rate=samp_rate, ppm=ppm)
+soapy_device_query="0" #can be a number or can correspond to a driver, e.g. soapy_device_query="driver=hackrf", see `rx_sdr --help`
+start_rtl_command="rx_sdr -d {device_query} -F CF32 -s {samp_rate} -f {center_freq} -p {ppm} -g {rf_gain} -".format(device_query=soapy_device_query, rf_gain=rf_gain, center_freq=center_freq, samp_rate=samp_rate, ppm=ppm)
 format_conversion=""
 ```