diff --git a/libs/gfx/include/psemek/gfx/texture_view.hpp b/libs/gfx/include/psemek/gfx/texture_view.hpp
index e8378485..6b714db6 100644
--- a/libs/gfx/include/psemek/gfx/texture_view.hpp
+++ b/libs/gfx/include/psemek/gfx/texture_view.hpp
@@ -12,7 +12,7 @@ namespace psemek::gfx
 	struct basic_texture_view
 	{
 		basic_texture<D, Target> const * texture = nullptr;
-		geom::box<float, D> part;
+		geom::box<float, D> part; // in pixels
 
 		basic_texture_view(basic_texture<D, Target> const * texture = nullptr);
 		basic_texture_view(basic_texture<D, Target> const * texture, geom::box<float, D> const & part);