diff --git a/cpukit/include/rtems/score/bsd-tree.h b/cpukit/include/rtems/score/bsd-tree.h
index dd4e2d1f5b..16dfda2d48 100644
--- a/cpukit/include/rtems/score/bsd-tree.h
+++ b/cpukit/include/rtems/score/bsd-tree.h
@@ -2,6 +2,15 @@
 /*	$OpenBSD: tree.h,v 1.7 2002/10/17 21:51:54 art Exp $	*/
 /* $FreeBSD: head/sys/sys/tree.h 347360 2019-05-08 18:47:00Z trasz $ */
 
+/**
+ * The contents of this file come from the above version of FreeBSD with local
+ * changes applied in Newlib and then migrated to RTEMS. These changes lock
+ * RTEMS to a specific version of this file. As a result, the macros defined
+ * in this file have been scoped with an RTEMS_ namespace. This allows other
+ * versions of tree.h to be used by RTEMS libraries and applications without
+ * conflicts.
+ */
+
 /*-
  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
  *