diff --git a/main.go b/main.go
index d5fb15f..371dcf7 100644
--- a/main.go
+++ b/main.go
@@ -1,3 +1,22 @@
+/*
+po-test
+Copyright (C) 2023 loveholidays
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 3 of the License, or (at your option) any later version.
+
+This program 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
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program; if not, write to the Free Software Foundation,
+Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+*/
+
 package main
 
 import (
diff --git a/pkg/tests/unittest.go b/pkg/tests/unittest.go
index 52f1da7..dd6e6a9 100644
--- a/pkg/tests/unittest.go
+++ b/pkg/tests/unittest.go
@@ -1,3 +1,22 @@
+/*
+po-test
+Copyright (C) 2023 loveholidays
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 3 of the License, or (at your option) any later version.
+
+This program 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
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program; if not, write to the Free Software Foundation,
+Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+*/
+
 package tests
 
 import (
diff --git a/pkg/tests/unittest_test.go b/pkg/tests/unittest_test.go
index bc3ee62..4ec5c9f 100644
--- a/pkg/tests/unittest_test.go
+++ b/pkg/tests/unittest_test.go
@@ -1,3 +1,22 @@
+/*
+po-test
+Copyright (C) 2023 loveholidays
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 3 of the License, or (at your option) any later version.
+
+This program 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
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program; if not, write to the Free Software Foundation,
+Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+*/
+
 package tests_test
 
 import (