From 4d004ccce24ba06f0043503570d1fdbd39c9211f Mon Sep 17 00:00:00 2001
From: "David E. O'Brien" <obrien@FreeBSD.org>
Date: Mon, 21 Aug 2023 23:40:46 -0700
Subject: [PATCH] Document strnstr()'s history.

---
 lib/libc/string/strstr.3 | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/libc/string/strstr.3 b/lib/libc/string/strstr.3
index 25af1ac6c08..7ff9ec8c54e 100644
--- a/lib/libc/string/strstr.3
+++ b/lib/libc/string/strstr.3
@@ -152,3 +152,9 @@ The
 function
 conforms to
 .St -isoC .
+.Sh HISTORY
+The
+.Fn strnstr
+function was introduced by
+.Fx 4.5
+and is non-standard.