diff --git a/usr.bin/protect/protect.1 b/usr.bin/protect/protect.1
index b9be4afe04b8..d27a8898dad5 100644
--- a/usr.bin/protect/protect.1
+++ b/usr.bin/protect/protect.1
@@ -1,89 +1,117 @@
 .\" Copyright (c) 2013 Hudson River Trading LLC
 .\" Written by: John H. Baldwin <jhb@FreeBSD.org>
 .\" All rights reserved.
 .\"
 .\" 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
 .\"
 .\" $FreeBSD$
 .\"
-.Dd September 19, 2013
+.Dd May 18, 2021
 .Dt PROTECT 1
 .Os
 .Sh NAME
 .Nm protect
 .Nd "protect processes from being killed when swap space is exhausted"
 .Sh SYNOPSIS
 .Nm
 .Op Fl i
 .Ar command
 .Nm
 .Op Fl cdi
 .Fl g Ar pgrp | Fl p Ar pid
 .Sh DESCRIPTION
 The
 .Nm
 command is used to mark processes as protected.
 The kernel does not kill protected processes when swap space is exhausted.
 Note that this protected state is not inherited by child processes by default.
 .Pp
 The options are:
 .Bl -tag -width XXXXXXXXXX
 .It Fl c
 Remove protection from the specified processes.
 .It Fl d
 Apply the operation to all current children of the specified processes.
 .It Fl i
 Apply the operation to all future children of the specified processes.
 .It Fl g Ar pgrp
 Apply the operation to all processes in the specified process group.
 .It Fl p Ar pid
 Apply the operation to the specified process.
 .It Ar command
 Execute
 .Ar command
 as a protected process.
 .El
 .Pp
 Note that only one of the
 .Fl p
 or
 .Fl g
 flags may be specified when adjusting the state of existing processes.
+.Pp
+Daemons can be protected on startup using
+.Ao Ar name Ac Ns Va _oomprotect
+option from
+.Xr rc.conf 5 .
 .Sh EXIT STATUS
 .Ex -std
 .Sh EXAMPLES
 Mark the Xorg server as protected:
 .Pp
 .Dl "pgrep Xorg | xargs protect -p"
 .Pp
 Protect all ssh sessions and their child processes:
 .Pp
 .Dl "pgrep sshd | xargs protect -dip"
 .Pp
 Remove protection from all current and future processes:
 .Pp
 .Dl "protect -cdi -p 1"
+.Pp
+Using
+.Xr ps 1
+to check if the protect flag has been applied to the process:
+.Pp
+.Dl "ps -O flags,flags2 -p 64430"
+.Pp
+.Dl " PID        F       F2 TT  STAT    TIME COMMAND"
+.Dl "64430 10104002 00000001  5  S+   0:00.00 ./main"
+.Dl "        ^P            ^PI"
+.Pp
+In the above example
+.Nm P
+points at the protected flag and
+.Nm PI
+points at the iheritance flag.
+The process is protected if
+.Nm P
+bit is set to 1. All children of this process will also be protected if
+.Nm PI
+bit is set to 1.
 .Sh SEE ALSO
-.Xr procctl 2
+.Xr ps 1 ,
+.Xr procctl 2 ,
+.Xr rc.conf 5
 .Sh BUGS
 If you protect a runaway process that allocates all memory the system will
 deadlock.