diff --git a/acinclude.m4 b/acinclude.m4
index eeb3aa6c58..1782df76e8 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1,6 +1,7 @@
 dnl
 dnl Local heartbeat autoconf macros
 dnl
 dnl Copyright (c) David Lee 2005
+dnl License: GNU General Public License (GPL)
 dnl
 sinclude([config/snmp_subagent.m4])