diff --git a/docs/reference/input/calibrate-compass.md b/docs/reference/input/calibrate-compass.md
index 2a644ea5..673fd554 100644
--- a/docs/reference/input/calibrate-compass.md
+++ b/docs/reference/input/calibrate-compass.md
@@ -11,6 +11,10 @@ input.calibrateCompass();
 The calibration will ask you to draw a circle or fill the LED screen by tilting the
 @boardname@.
 
+The compass calibration is stored in memory by the @boardname@, so next time you press the reset button or remove and replace the power the calibration will be remembered.
+
+When you flash a new program to your @boardname@ via USB, this memory is cleared so you will have to re-calibrate it.
+
 If you are calibrating or using the compass near metal, it might
 confuse the @boardname@.