diff --git a/m4/CHECK_ENUM_VALUE.m4 b/m4/CHECK_ENUM_VALUE.m4
index 8c4e3d22e2..50bbe23a74 100644
--- a/m4/CHECK_ENUM_VALUE.m4
+++ b/m4/CHECK_ENUM_VALUE.m4
@@ -1,19 +1,21 @@
 # CHECK_ENUM_VALUE([HEADER], [ENUM_NAME], [ENUM_VALUE])
 #
 # Define HAVE_[ENUM_NAME]_[ENUM_VALUE] if the specified enum value is
 # available.
 dnl
-dnl Copyright 2018 Andrew Beekhof <andrew@beekhof.net>
+dnl Copyright 2018-2020 the Pacemaker project contributors
+dnl
+dnl The version control history for this file may have further details.
 dnl
 dnl This source code is licensed under the GNU General Public License version 2
 dnl or later (GPLv2+) WITHOUT ANY WARRANTY.
 
 AC_DEFUN([CHECK_ENUM_VALUE], [
     AC_MSG_CHECKING(whether $1 defines enum $2 value $3)
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <$1>],
                                        [enum $2 check_$2_$3 = $3])],
                       [AC_DEFINE_UNQUOTED(HAVE_$2_$3, 1,
                                           [Whether enum $2 supports $3])
                        AC_MSG_RESULT(yes)],
                       [AC_MSG_RESULT(no)])
 ])