diff --git a/ci.nix b/ci.nix
index b8340f7..ef1aab0 100644
--- a/ci.nix
+++ b/ci.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.
+
 with import <nixpkgs> { };
 
 let