diff --git a/conv_test.go b/conv_test.go
index d4c1c09..0dc4987 100644
--- a/conv_test.go
+++ b/conv_test.go
@@ -1,3 +1,20 @@
+/*
+ * This file is part of the N2CMU (https://github.com/nthnn/n2cmu).
+ * Copyright (c) 2024 Nathanne Isip.
+ *
+ * This program 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, version 3.
+ *
+ * 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
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
 package main
 
 import (
diff --git a/n2_test.go b/n2_test.go
index 826efc8..8c4ddee 100644
--- a/n2_test.go
+++ b/n2_test.go
@@ -1,3 +1,20 @@
+/*
+ * This file is part of the N2CMU (https://github.com/nthnn/n2cmu).
+ * Copyright (c) 2024 Nathanne Isip.
+ *
+ * This program 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, version 3.
+ *
+ * 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
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
 package main
 
 import (