MInor. more precise explanation on timing

apps/previewer/src/viewer.cpp

@@ -245,7 +245,7 @@ Viewer::Viewer(std::string const &full_path_to_mesh)
   std::vector<mrf::math::Vec3f>().swap(_tangents); std::vector<mrf::math::Vec3f>().swap(_uvs); std::vector<mrf::math::Vec3f>().swap(_color_per_vertex);
 
   ply_timer.stop();
-  std::cout <<"[TRACE] Data re-ordering for VBO Completed. " << ply_timer ;
+  std::cout <<"[TRACE] Data re-ordering (including normals and tangents computation) for VBO Completed. " << ply_timer ;
   std::cout <<"[INFO] Available RAM Memory in MB is " <<  mrf::util::CPUMemory::availableMemory() << std::endl;