diff --git a/src/main.rs b/src/main.rs
index e7a11a9..f6f79d1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,20 @@
+/* Copyright 2021 Daniel Mowitz
+ * This file is part of Mention2Mail.
+ *
+ * Mention2Mail is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Mention2Mail 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Mention2Mail.  If not, see <https://www.gnu.org/licenses/>.
+ */ 
+
 fn main() {
     println!("Hello, world!");
 }