diff --git a/Makefile.am b/Makefile.am
index 48a6bedb..ac3b0559 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,4 +1,8 @@
 
+# Copyright (C) 2006 - 2008 Vreixo Formoso <metalpain2002@yahoo.es>
+# Copyright (C) 2008 - 2019 Thomas Schmitt <scdbackup@gmx.net>
+# Provided under GPL version 2 or later.
+ 
 # ts A90315 : LIBBURNIA_PKGCONFDIR is defined OS specific in acinclude.m4
 # was: pkgconfigdir=$(libdir)/pkgconfig
 pkgconfigdir=$(LIBBURNIA_PKGCONFDIR)
diff --git a/acinclude.m4 b/acinclude.m4
index 00c3486b..8eba2623 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1,3 +1,8 @@
+dnl Copyright (C) 2008 - 2019 Thomas Schmitt <scdbackup@gmx.net>
+dnl Copyright (C) 2000-2002, 2007-2009 Free Software Foundation, Inc.
+dnl Provided under GPL version 2 or later.
+
+
 AC_DEFUN([LIBBURNIA_SET_FLAGS],
 [
 case $target_os in