diff --git a/src/drivers/px4fmu/fmu.cpp b/src/drivers/px4fmu/fmu.cpp
index 190a698fb1..9fad2978ca 100644
--- a/src/drivers/px4fmu/fmu.cpp
+++ b/src/drivers/px4fmu/fmu.cpp
@@ -397,7 +397,7 @@ PX4FMU::set_mode(Mode mode)
 
 		break;
 
-	case MODE_4PWM: // v1 multi-port as 4 PWM outs
+	case MODE_4PWM: // v1 or v2 multi-port as 4 PWM outs
 		DEVICE_DEBUG("MODE_4PWM");
 
 		/* default output rates */