diff --git a/Settings.md b/Settings.md
index 52b1c00..5cb1629 100644
--- a/Settings.md
+++ b/Settings.md
@@ -3,7 +3,7 @@ This section provides a set of utilities that can be used to configure some aspe
 This allow the setting of the tone Key mixer setting as a percent of the audio level.
 ## Radio
 In the radio section there are two options, 
-1. One for turning on/off the External Clock.
+1. One for turning on/off 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. Second item is turning on or off the Antenna Bias Tee.
 ## User Interface
 The UI interface  setting for the following can be Enabled (tick) or Disabled (x) or selected value for the backlight timeout: