diff --git a/msg/tools/uorb_to_ros_rtps_ids.py b/msg/tools/uorb_to_ros_rtps_ids.py
index 44d5a6ef79..9bff06d373 100755
--- a/msg/tools/uorb_to_ros_rtps_ids.py
+++ b/msg/tools/uorb_to_ros_rtps_ids.py
@@ -14,7 +14,7 @@ __author__ = 'PX4 Development Team'
 __copyright__ = \
     '''
      '
-     '   Copyright (c) 2018-2019 PX4 Development Team. All rights reserved.
+     '   Copyright (c) 2018-2021 PX4 Development Team. All rights reserved.
      '
      ' Redistribution and use in source and binary forms, or without
      ' modification, permitted provided that the following conditions
@@ -114,6 +114,10 @@ def update_yaml_file(list, file):
     """
     try:
         with open(file, 'w') as f:
+            f.write("# AUTOGENERATED-FILE! DO NOT MODIFY IT DIRECTLY.\n#"
+                " Edit instead the same file under PX4-Autopilot/msg/tools and"
+                " use the \n# PX4-Autopilot/msg/tools/uorb_to_ros_rtps_ids.py"
+                " to regenerate this file.\n")
             yaml.dump(list, f, Dumper=IndenterDumper, default_flow_style=False)
             if verbose:
                 if in_file == out_file:
@@ -144,7 +148,8 @@ if __name__ == "__main__":
     args = parser.parse_args()
     verbose = args.verbose
     in_file = args.input_file
-    out_file = args.output_file if (args.output_file != in_file and args.output_file != "") else in_file
+    out_file = args.output_file if (
+        args.output_file != in_file and args.output_file != "") else in_file
 
     if verbose:
         print("-- PX4 to ROS RTPS Ids --")