diff --git a/default.nix b/default.nix
index 5d231d5..81937c9 100644
--- a/default.nix
+++ b/default.nix
@@ -1,3 +1,6 @@
+# Licensed under GNU Lesser General Public License v3 or later, see COPYING.
+# Copyright (c) 2019 Alexander Sosedkin and other contributors, see AUTHORS.
+
 { pkgs ? import <nixpkgs> { } }:
 
 rec {