diff --git a/src/modules/mavlink/mavlink_messages.cpp b/src/modules/mavlink/mavlink_messages.cpp
index d3f35cdb97..6206fb4898 100644
--- a/src/modules/mavlink/mavlink_messages.cpp
+++ b/src/modules/mavlink/mavlink_messages.cpp
@@ -2268,7 +2268,7 @@ protected:
 				for (unsigned i = 0; i < 8; i++) {
 					if (act.output[i] > PWM_DEFAULT_MIN / 2) {
 						if (i < n) {
-							/* scale PWM out PWM_DEFAULT_MIN..PWM_DEFAULT_MAX us to -1..1 for rotors */
+							/* scale PWM out PWM_DEFAULT_MIN..PWM_DEFAULT_MAX us to 0..1 for rotors */
 							out[i] = (act.output[i] - PWM_DEFAULT_MIN) / (PWM_DEFAULT_MAX - PWM_DEFAULT_MIN);
 
 						} else {