diff --git a/games-board/tablebase-syzygy/tablebase-syzygy-0_pre20131213-r101.ebuild b/games-board/tablebase-syzygy/tablebase-syzygy-0_pre20131213-r101.ebuild
index 5e676938e768b..8ee6396f82f02 100644
--- a/games-board/tablebase-syzygy/tablebase-syzygy-0_pre20131213-r101.ebuild
+++ b/games-board/tablebase-syzygy/tablebase-syzygy-0_pre20131213-r101.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2022 Gentoo Authors
+# Copyright 1999-2023 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -41,6 +41,8 @@ LICENSE="public-domain" # machine-generated tables
 SLOT="0"
 KEYWORDS="amd64 x86"
 IUSE="6-pieces"
+# fetch restriction only for the 6-pieces tables, by selective
+# URI restriction ("mirror+" in SRC_URI)
 RESTRICT="fetch"
 
 RDEPEND="!${CATEGORY}/${PN}:nofetch"