diff --git a/source/main.rs b/source/main.rs
index 305bb27..09e8058 100644
--- a/source/main.rs
+++ b/source/main.rs
@@ -1,3 +1,18 @@
+// Copyright (C) 2022 Bauke <me@bauke.xyz>
+//
+// This program 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.
+//
+// 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 Affero General Public License for more
+// details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
 //! # Steam RSS
 //!
 //! > **Get RSS feeds for Steam games.**