diff --git a/build/openldap.m4 b/build/openldap.m4
index 4b5aac9cba..defe9f770f 100644
--- a/build/openldap.m4
+++ b/build/openldap.m4
@@ -1,3 +1,5 @@
+dnl Copyright 1998 The OpenLDAP Foundation,  All Rights Reserved.
+dnl COPYING RESTRICTIONS APPLY, See COPYRIGHT file
 dnl
 dnl OpenLDAP Autoconf Macros
 dnl