diff --git a/TUNING_GUIDE_ArduCopter.md b/TUNING_GUIDE_ArduCopter.md
index 30c6aa983..feca1e715 100644
--- a/TUNING_GUIDE_ArduCopter.md
+++ b/TUNING_GUIDE_ArduCopter.md
@@ -782,6 +782,10 @@ Setup the lua script using:
 1. Press `Upload selected params to FC, and advance to next file` button.
 1. Close *ArduPilot Methodic Configurator*
 
+WARNING: Quicktune requires moderate wind disturbances to calibrate properly.
+Flying in completely calm conditions or perfectly steady wind can cause Quicktune to calculate overly aggressive PID values.
+These excessive settings may cause dangerous oscillations and potential crashes when your vehicle later encounters normal wind conditions.
+
 Perform the flight and afterward:
 
 1. Connect the flight controller to the PC
@@ -859,6 +863,10 @@ Setup the lua script using:
 1. Press `Upload selected params to FC, and advance to next file` button.
 1. When asked *Update file with values from FC?* select `Close` to close the application and go perform the experiment.
 
+WARNING: Quicktune requires moderate wind disturbances to calibrate properly.
+Flying in completely calm conditions or perfectly steady wind can cause Quicktune to calculate overly aggressive PID values.
+These excessive settings may cause dangerous oscillations and potential crashes when your vehicle later encounters normal wind conditions.
+
 Perform the flight and afterward:
 
 ### 9.2.2 Store quicktune results to file