diff --git a/CMakeLists.txt b/CMakeLists.txt
index 76cc9c7..c1e0bc4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,3 +1,20 @@
+# This file is part of monofonIC (MUSIC2)
+# A software package to generate ICs for cosmological simulations
+# Copyright (C) 2020 by Oliver Hahn
+#
+# monofonIC is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# monofonIC is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see .
+
cmake_minimum_required(VERSION 3.9)
set(PRGNAME monofonIC)
diff --git a/include/bounding_box.hh b/include/bounding_box.hh
index 6b70bcf..c40788d 100644
--- a/include/bounding_box.hh
+++ b/include/bounding_box.hh
@@ -1,3 +1,20 @@
+// This file is part of monofonIC (MUSIC2)
+// A software package to generate ICs for cosmological simulations
+// Copyright (C) 2020 by Oliver Hahn
+//
+// monofonIC is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// monofonIC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see .
+
#pragma once
#include