From b7dd97fb122d697c100ffc378fc67edcb74cd39f Mon Sep 17 00:00:00 2001
From: Mateusz Piotrowski <0mp@FreeBSD.org>
Date: Mon, 18 Sep 2023 21:29:09 +0100
Subject: tmpfs.5: Document option union

As noted in 59169d915600333b7d9187097f157865ba642256,
tmpfs(5) supports the union option just fine.

MFC after:	7 days

(cherry picked from commit 1d225179fd5d7eb932486a94abb8b76be7e44241)
---
 share/man/man5/tmpfs.5 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/share/man/man5/tmpfs.5 b/share/man/man5/tmpfs.5
index 8fff1c15815d..bf07f06de026 100644
--- a/share/man/man5/tmpfs.5
+++ b/share/man/man5/tmpfs.5
@@ -154,6 +154,9 @@ main memory and swap space) will be used.
 .It Cm uid
 Set the user ID of the root inode of the file system.
 The default is the mount point's UID.
+.It Cm union
+Refer to
+.Xr mount 8 .
 .El
 .Sh EXAMPLES
 Mount a
-- 
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