diff --git a/spreadsheet/readme.txt b/spreadsheet/readme.txt
index f0b13413..7b5b23db 100644
--- a/spreadsheet/readme.txt
+++ b/spreadsheet/readme.txt
@@ -1,6 +1,10 @@
 This spreadsheet is for analyzing the CubeSat Simulator telemetry.
 
-It has been tested with Office 365 (Windows) and Office Excel for Mac (Version: 16.16.6) and LibreOffice Calc Version: 6.1.4.2 (Windows)
+This is only used for the AFSK 1200 APRS telemetry mode.  The latest version of the CubeSatSim supports Fox-1 telemetry emulation, so the use of this mode is encouraged - it does not use this spreadsheet as the telemetry is automatically decoded and graphed.
+
+Setting up FoxTelem is described here https://github.com/alanbjohnston/CubeSatSim/wiki/Ground-Station
+
+This spreadsheet has been tested with Office 365 (Windows) and Office Excel for Mac (Version: 16.16.6) and LibreOffice Calc Version: 6.1.4.2 (Windows)
 
 A version for Google Docs is available for copying and download at: