diff --git a/src/lib/control_allocation/actuator_effectiveness/ActuatorEffectiveness.hpp b/src/lib/control_allocation/actuator_effectiveness/ActuatorEffectiveness.hpp
index 9bcf700207..8e7028f771 100644
--- a/src/lib/control_allocation/actuator_effectiveness/ActuatorEffectiveness.hpp
+++ b/src/lib/control_allocation/actuator_effectiveness/ActuatorEffectiveness.hpp
@@ -61,7 +61,7 @@ enum class ActuatorType {
 };
 
 enum class EffectivenessUpdateReason {
-	NO_EXTERNAL_UPDATE = 0,
+	NO_EXTERNAL_UPDATE = 0, ///< Only update the effectiveness matrix if rotor tilt has changed significantly
 	CONFIGURATION_UPDATE = 1, ///< config changes (parameter)
 	MOTOR_ACTIVATION_UPDATE = 2, ///< motor failure detected or certain redundant motors are switched off to save energy
 	BATTERY_SCALE_UPDATE = 3, ///< Update with low rate to recalculate battery scale compensation