From 74ca6a22f9c1ff9ea407de7053891fca5a680402 Mon Sep 17 00:00:00 2001
From: "David E. O'Brien" <obrien@FreeBSD.org>
Date: Wed, 16 Feb 2022 20:03:48 -0800
Subject: [PATCH] Document when zfree(9) was added to FreeBSD.

---
 share/man/man9/malloc.9 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/share/man/man9/malloc.9 b/share/man/man9/malloc.9
index 71375e90951..c240344ea77 100644
--- a/share/man/man9/malloc.9
+++ b/share/man/man9/malloc.9
@@ -381,3 +381,7 @@ message.
 .Xr domainset 9 ,
 .Xr memguard 9 ,
 .Xr vnode 9
+.Sh HISTORY
+.Fn zfree
+first appeared in
+.Fx 13.0 .