diff --git a/COPYRIGHT.txt b/COPYRIGHT.txt
new file mode 100644
index 000000000..404404f89
--- /dev/null
+++ b/COPYRIGHT.txt
@@ -0,0 +1,7 @@
+Copyright (C) 2023 Pachli Association, <https://pachli.app/>,
+made available under the GNU General Public License version 3.0.
+
+See LICENSE.txt for the full text of the GPL 3.0.
+
+Portions of this software are derived from the Tusky project,
+<https://www.tusky.app/>, also licensed under the GPL 3.0.