diff --git a/m4/ax_pkg_config.m4 b/m4/ax_pkg_config.m4
index 6be3dd2..bccb591 100644
--- a/m4/ax_pkg_config.m4
+++ b/m4/ax_pkg_config.m4
@@ -1,6 +1,7 @@
 dnl -*- autoconf -*-
 dnl
 dnl Copyright (c) 2017 The University of Oslo
+dnl Copyright (c) 2017-2018 Dag-Erling Smørgrav
 dnl All rights reserved.
 dnl
 dnl Redistribution and use in source and binary forms, with or without