diff --git a/msg/Rpm.msg b/msg/Rpm.msg
index fcec7edaf8..ca69e50fdb 100644
--- a/msg/Rpm.msg
+++ b/msg/Rpm.msg
@@ -1,4 +1,4 @@
 uint64 timestamp # time since system start (microseconds)
 
 float32 rpm_estimate # filtered revolutions per minute
-float32 rpm_raw # measured rpm
+float32 rpm_raw
diff --git a/src/drivers/camera_capture/camera_capture.cpp b/src/drivers/camera_capture/camera_capture.cpp
index 7bf3813542..2d62d85086 100644
--- a/src/drivers/camera_capture/camera_capture.cpp
+++ b/src/drivers/camera_capture/camera_capture.cpp
@@ -81,7 +81,7 @@ CameraCapture::CameraCapture() :
 		int32_t function;
 
 		if (function_handle != PARAM_INVALID && param_get(function_handle, &function) == 0) {
-			if (function == 2032) { // Camera_Capture
+			if (function == 2032) { // Camera_Capture see mixer_module/output_functions.yaml parameter metadata definition
 				_capture_channel = i;
 			}
 		}
diff --git a/src/drivers/camera_trigger/interfaces/src/camera_interface.cpp b/src/drivers/camera_trigger/interfaces/src/camera_interface.cpp
index 02e9119cae..e15468b03a 100644
--- a/src/drivers/camera_trigger/interfaces/src/camera_interface.cpp
+++ b/src/drivers/camera_trigger/interfaces/src/camera_interface.cpp
@@ -51,7 +51,7 @@ void CameraInterface::get_pins()
 		int32_t function;
 
 		if (function_handle != PARAM_INVALID && param_get(function_handle, &function) == 0) {
-			if (function == 2000) { // Camera_Trigger
+			if (function == 2000) { // Camera_Trigger see mixer_module/output_functions.yaml parameter metadata definition
 				_pins[pin_index++] = i;
 			}
 		}
diff --git a/src/drivers/pps_capture/PPSCapture.cpp b/src/drivers/pps_capture/PPSCapture.cpp
index 399f034fbf..8a13c48c35 100644
--- a/src/drivers/pps_capture/PPSCapture.cpp
+++ b/src/drivers/pps_capture/PPSCapture.cpp
@@ -70,7 +70,7 @@ bool PPSCapture::init()
 		int32_t function;
 
 		if (function_handle != PARAM_INVALID && param_get(function_handle, &function) == 0) {
-			if (function == 2064) { // PPS_Input
+			if (function == 2064) { // PPS_Input see mixer_module/output_functions.yaml parameter metadata definition
 				_channel = i;
 			}
 		}
diff --git a/src/drivers/rpm_capture/CMakeLists.txt b/src/drivers/rpm_capture/CMakeLists.txt
index db52504b4f..b2639cba1d 100644
--- a/src/drivers/rpm_capture/CMakeLists.txt
+++ b/src/drivers/rpm_capture/CMakeLists.txt
@@ -1,6 +1,6 @@
 ############################################################################
 #
-#   Copyright (c) 2021 PX4 Development Team. All rights reserved.
+#   Copyright (c) 2024 PX4 Development Team. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
diff --git a/src/drivers/rpm_capture/RPMCapture.cpp b/src/drivers/rpm_capture/RPMCapture.cpp
index 8a9f2f795b..8330f77d13 100644
--- a/src/drivers/rpm_capture/RPMCapture.cpp
+++ b/src/drivers/rpm_capture/RPMCapture.cpp
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2021 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2024 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -66,7 +66,7 @@ bool RPMCapture::init()
 		int32_t function;
 
 		if (function_handle != PARAM_INVALID && param_get(function_handle, &function) == 0) {
-			if (function == 2070) { // RPM_Input
+			if (function == 2070) { // RPM_Input see mixer_module/output_functions.yaml parameter metadata definition
 				_channel = i;
 			}
 		}
diff --git a/src/drivers/rpm_capture/RPMCapture.hpp b/src/drivers/rpm_capture/RPMCapture.hpp
index aec1b126e4..6128125711 100644
--- a/src/drivers/rpm_capture/RPMCapture.hpp
+++ b/src/drivers/rpm_capture/RPMCapture.hpp
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2021 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2024 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/src/drivers/rpm_capture/rpm_capture_params.c b/src/drivers/rpm_capture/rpm_capture_params.c
index 88f0df613c..13bd3fb7a7 100644
--- a/src/drivers/rpm_capture/rpm_capture_params.c
+++ b/src/drivers/rpm_capture/rpm_capture_params.c
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2021 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2024 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions