diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 3be2fd4623..8e8790b29a 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -19,7 +19,7 @@
 ;;; Copyright © 2015, 2016 Chris Marusich <cmmarusich@gmail.com>
 ;;; Copyright © 2016 Danny Milosavljevic <dannym+a@scratchpost.org>
 ;;; Copyright © 2016 Lukas Gradl <lgradl@openmailbox.org>
-;;; Copyright © 2016, 2018-2019 Hartmut Goebel <h.goebel@crazy-compilers.com>
+;;; Copyright © 2016, 2018, 2019 Hartmut Goebel <h.goebel@crazy-compilers.com>
 ;;; Copyright © 2016 Daniel Pimentel <d4n1@d4n1.org>
 ;;; Copyright © 2016 Sou Bunnbu <iyzsong@gmail.com>
 ;;; Copyright © 2016, 2017 Troy Sankey <sankeytms@gmail.com>