diff --git a/src/3d/terrain/qgsonlineterraingenerator.cpp b/src/3d/terrain/qgsonlineterraingenerator.cpp
index 09e19d8b612b..246b7c6ac0a0 100644
--- a/src/3d/terrain/qgsonlineterraingenerator.cpp
+++ b/src/3d/terrain/qgsonlineterraingenerator.cpp
@@ -1,3 +1,18 @@
+/***************************************************************************
+  qgsonlineterraingenerator.cpp
+  --------------------------------------
+  Date                 : March 2019
+  Copyright            : (C) 2019 by Martin Dobias
+  Email                : wonder dot sk at gmail dot com
+ ***************************************************************************
+ *                                                                         *
+ *   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 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
 #include "qgsonlineterraingenerator.h"
 
 #include "qgsdemterraintileloader_p.h"
diff --git a/src/3d/terrain/qgsterraindownloader.cpp b/src/3d/terrain/qgsterraindownloader.cpp
index 06f76867d513..34cfee70fa96 100644
--- a/src/3d/terrain/qgsterraindownloader.cpp
+++ b/src/3d/terrain/qgsterraindownloader.cpp
@@ -73,7 +73,7 @@ double QgsTerrainDownloader::findBestTileResolution( double requestedMupp )
 
 void QgsTerrainDownloader::tileImageToHeightMap( const QImage &img, QByteArray &heightMap )
 {
-  // assuming ARGB preformatted but with alpha 255
+  // assuming ARGB premultiplied but with alpha 255
   const QRgb *rgb = reinterpret_cast<const QRgb *>( img.constBits() );
   int count = img.width() * img.height();
   heightMap.resize( sizeof( float ) * count );