diff --git a/COPYRIGHT b/COPYRIGHT
index 462a84e9ac..e4001a4fb0 100644
--- a/COPYRIGHT
+++ b/COPYRIGHT
@@ -10,10 +10,14 @@ Copyright: © 2012-2017 Joey Hess <id@joeyh.name>
            © 2014 Sören Brunk
 License: AGPL-3+
 
-Files: doc/special_remotes/external/*
+Files: doc/special_remotes/external/* 
 Copyright: © 2013 Joey Hess <id@joeyh.name>
 License: GPL-3+
 
+Files: doc/design/external_backend_protocol/git-annex-backend-XFOO
+Copyright: © 2020 Joey Hess <id@joeyh.name>
+License: GPL-3+
+
 Files: Remote/Ddar.hs
 Copyright: © 2011-2020 Joey Hess <id@joeyh.name>
            © 2014 Robie Basak <robie@justgohome.co.uk>