diff --git a/Using-RTLSDR-on-HF-with-an-upconverter.md b/Using-RTLSDR-on-HF-with-an-upconverter.md
index a7fc09f..d2d2f7a 100644
--- a/Using-RTLSDR-on-HF-with-an-upconverter.md
+++ b/Using-RTLSDR-on-HF-with-an-upconverter.md
@@ -14,12 +14,12 @@ For example, if you want to show 1 MHz on the waterfall, from 14 MHz to 15 MHz (
 ```python
 samp_rate = 1024000
 center_freq = 134500000 # = 14500000+120000000, this is where the center of the desired range is after upconversion
-show_center_freq = 14500000 # this is what will be the center of the scale on the UI
+shown_center_freq = 14500000 # this is what will be the center of the scale on the UI
 ```
 
 Another way to configure this is to give the 120 MHz frequency offset the following way:
 ```python
 samp_rate = 1024000
 center_freq = 134500000
-show_center_freq = center_freq - 120000000
+shown_center_freq = center_freq - 120000000
 ```