diff --git a/Settings.md b/Settings.md
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+++ b/Settings.md
@@ -4,7 +4,7 @@ This allow the setting of the tone Key mixer setting as a percent of the audio l
 ## Radio
 In the radio section there are two options, 
 1. Enable/disable the Clock Output. Note that you can change the CLKOUT frequency between 10 kHz to 60000 kHz; press OK when the frequency is highlighted to select which digit position to modify and then use the encoder to scroll through the digit values.
-2. Enable/disable the Antenna Bias voltage.
+2. Enable/disable the Antenna Bias voltage.  If enabled, ensure that all devices attached to the antenna connector can accept a DC bias voltage.
 ## User Interface
 The UI interface  setting for the following can be Enabled (tick) or Disabled (x) or selected value for the backlight timeout:
 * Backlight off after 5 seconds( default) or can be set to 5,15,30 seconds or 1,3,5,10 minutes.