diff --git a/3d-viewer/3d_viewer_id.h b/3d-viewer/3d_viewer_id.h
index 0374e1ae66..da520b59fe 100644
--- a/3d-viewer/3d_viewer_id.h
+++ b/3d-viewer/3d_viewer_id.h
@@ -1,5 +1,21 @@
-/**
- * @file 3d_viewer_id.h
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2023 <author>
+ * Copyright (C) 2023 KiCad Developers, see AUTHORS.txt for contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 /**
@@ -11,6 +27,7 @@
  * However the number of IDs should be < ROOM_FOR_3D_VIEWER, defined in id.h
  * Please change the value of ROOM_FOR_3D_VIEWER if too small.
  */
+#pragma once
 
 #include <id.h>        // Generic Id.