diff --git a/.domains b/.domains
index d18b449..3c90a14 100644
--- a/.domains
+++ b/.domains
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2023 The "Notes on OpenPGP" project
+# SPDX-License-Identifier: CC0-1.0
+#
 # See https://docs.codeberg.org/codeberg-pages/using-custom-domain/ for
 # details. The first domain should be "main" the rest are aliases.