diff --git a/src/modules/px4iofirmware/protocol.h b/src/modules/px4iofirmware/protocol.h
index d4b849c050..08092bd338 100644
--- a/src/modules/px4iofirmware/protocol.h
+++ b/src/modules/px4iofirmware/protocol.h
@@ -230,15 +230,15 @@ enum {							/* DSM bind states */
 #define PX4IO_P_SETUP_SCALE_PITCH		20	/**< Pitch scale, in actuator units */
 #define PX4IO_P_SETUP_SCALE_YAW			21	/**< Yaw scale, in actuator units */
 
-#define PX4IO_P_SETUP_SBUS_RATE			22	/* frame rate of SBUS1 output in Hz */
+#define PX4IO_P_SETUP_SBUS_RATE			22	/**< frame rate of SBUS1 output in Hz */
 
-#define PX4IO_P_SETUP_MOTOR_SLEW_MAX		24 	/* max motor slew rate */
+#define PX4IO_P_SETUP_MOTOR_SLEW_MAX		24 	/**< max motor slew rate */
 
-#define PX4IO_P_SETUP_THR_MDL_FAC 		25	/* factor for modelling static pwm output to thrust relationship */
+#define PX4IO_P_SETUP_THR_MDL_FAC 		25	/**< factor for modelling static pwm output to thrust relationship */
 
-#define PX4IO_P_SETUP_THERMAL			26	/* thermal management */
+#define PX4IO_P_SETUP_THERMAL			26	/**< thermal management */
 
-#define PX4IO_P_SETUP_AIRMODE 			27 	/* air-mode */
+#define PX4IO_P_SETUP_AIRMODE 			27 	/**< air-mode */
 
 #define PX4IO_P_SETUP_ENABLE_FLIGHTTERMINATION	28	/**< flight termination; false if the circuit breaker (CBRK_FLIGHTTERM) is set */