diff --git a/examples/environment_example.cpp b/examples/environment_example.cpp
index 20a10101de6e46b9bbc96559a50b7b0880c7639e..99ae9d86678b25d9e82d299f3a30be10a9fcd6ad 100644
--- a/examples/environment_example.cpp
+++ b/examples/environment_example.cpp
@@ -1,3 +1,11 @@
+/*
+ * (c) Copyright 2022 CORSIKA Project, corsika-project@lists.kit.edu
+ *
+ * This software is distributed under the terms of the GNU General Public
+ * Licence version 3 (GPL Version 3). See file LICENSE for a full version of
+ * the license.
+ */
+
 #include <corsika/media/Environment.hpp>
 #include <corsika/media/HomogeneousMedium.hpp>
 #include <corsika/media/IMediumModel.hpp>