diff --git a/src/main.rs b/src/main.rs
index 477d25d..7295c9e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
 use clap::Parser;
 use pow_sha256::ConfigBuilder;
 use rayon::prelude::*;