diff --git a/make/projects-dir.mk b/make/projects-dir.mk
index 1dc8d601..b292d08e 100644
--- a/make/projects-dir.mk
+++ b/make/projects-dir.mk
@@ -1,12 +1,16 @@
 #
-# $Id$
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Manage multiple software repositories in one tree
+#
+# (C) Copyright 2001-2019, Jan Lindemann <jan@janware.com>
 #
 # This is the top-level Makefile for a janware software build tree. It is
 # provided under the terms of the GNU Lesser Public License, Version 2.
 #
 # Some of its targets download software from janware GmbH servers. For those,
 # you will need a janware.com user account. Ask admin@janware.com if you want
-# one, then define the JANWARE_USER = <janware user name> environment variable.
+# one, then define the JANWARE_USER=<janware user name> environment variable.
 #
 # Current documentation on how this Makefile is meant to be used can be found
 # under https://janware.com/wiki/pub/en/sw/build/. Running "make doc-module"