diff --git a/protonkey b/protonkey
index 4595cc5..b36e9d1 100755
--- a/protonkey
+++ b/protonkey
@@ -1,5 +1,21 @@
 #!/bin/sh
 
+# Copyright (c) 2022 Emma Tebibyte
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# Protonkey 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.
+# 
+# Protonkey 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/.
+
 if ! test -n "$1"; then
 	printf "Usage: %s [ProtonMail address]\n" "$0"
 	exit 64 # syexits(3) EX_USAGE