diff --git a/share/man/man9/prison_check.9 b/share/man/man9/prison_check.9
index b3bdcf6b4571..7f174e3ceb2e 100644
--- a/share/man/man9/prison_check.9
+++ b/share/man/man9/prison_check.9
@@ -1,61 +1,59 @@
 .\"
 .\" Copyright (c) 2003 Joseph Koshy <jkoshy@FreeBSD.org>
 .\"
 .\" All rights reserved.
 .\"
 .\" This program is free software.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions
 .\" are met:
 .\" 1. Redistributions of source code must retain the above copyright
 .\"    notice, this list of conditions and the following disclaimer.
 .\" 2. Redistributions in binary form must reproduce the above copyright
 .\"    notice, this list of conditions and the following disclaimer in the
 .\"    documentation and/or other materials provided with the distribution.
 .\"
 .\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
 .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 .\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
 .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd December 11, 2003
+.Dd August 18, 2023
 .Dt PRISON_CHECK 9
 .Os
 .Sh NAME
 .Nm prison_check
-.Nd determine if two credentials belong to the same jail
+.Nd determine if subjects may see entities according to jail restrictions
 .Sh SYNOPSIS
 .In sys/jail.h
 .Ft int
 .Fn prison_check "struct ucred *cred1" "struct ucred *cred2"
 .Sh DESCRIPTION
-This function can be used to determine if the two credentials
+This function determines if a subject with credentials
 .Fa cred1
-and
+is denied access to subjects or objects with credentials
 .Fa cred2
-belong to the same jail.
+according to the policy that a subject can see subjects or objects in its own
+jail or any sub-jail of it.
 .Sh RETURN VALUES
 The
 .Fn prison_check
 function
 returns
 .Er ESRCH
 if
-.Fa cred1
-has been jailed, and
-.Fa cred1
-and
 .Fa cred2
-do not belong to the same jail.
+is not in the same jail or a sub-jail of that of
+.Fa cred1 .
 In all other cases,
 .Fn prison_check
 returns zero.
 .Sh SEE ALSO
 .Xr jail 2