diff --git a/Tools/mavproxy_modules/README.md b/Tools/mavproxy_modules/README.md
index eb2a60709f..5db2ef7a32 100644
--- a/Tools/mavproxy_modules/README.md
+++ b/Tools/mavproxy_modules/README.md
@@ -10,6 +10,10 @@ This module interfaces with the `calibration` model of SITL. It provides
 commands to actuate on the vehicle's rotation to simulate a calibration
 process.
 
+Make sure to pass `--model calibration` to the SITL binary in order to be able
+use this module's commands. You can also use
+`[sim_vehicle.py](../autotest/sim_vehicle.py)` with `--frame calibration`.
+
 ### Accelerometer Calibration ###
 The command `sitl_accelcal` listens to the accelerometer calibration status
 texts and set the vehicle in the desired attitude. Example: