diff --git a/groundstation/config_webrx_pi_hf.py b/groundstation/config_webrx_pi_hf.py
index eed31756..9571a410 100644
--- a/groundstation/config_webrx_pi_hf.py
+++ b/groundstation/config_webrx_pi_hf.py
@@ -196,7 +196,7 @@ sdrs = {
    "rtlsdr-hf": {
         "name": "RTL-SDR",
         "type": "rtl_sdr",
-        "ppm": 0
+        "ppm": 0,
         "direct_sampling": 2,
         # you can change this if you use an upconverter. formula is:
         # center_freq + lfo_offset = actual frequency on the sdr