diff --git a/share/man/man4/linux.4 b/share/man/man4/linux.4
index b24e3dbc9f79..6054ae1aa455 100644
--- a/share/man/man4/linux.4
+++ b/share/man/man4/linux.4
@@ -1,187 +1,188 @@
 .\" Copyright (c) 2000 Sheldon Hearn
 .\" 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 January 2, 2022
+.Dd January 9, 2022
 .Dt LINUX 4
 .Os
 .Sh NAME
 .Nm linux
 .Nd Linux ABI support
 .Sh SYNOPSIS
 To enable the Linux ABI at boot time, place the following line in
 .Xr rc.conf 5 :
 .Bd -literal -offset indent
 linux_enable="YES"
 .Ed
 .Sh DESCRIPTION
 The
 .Nm
-module provides limited Linux ABI (application binary interface) compatibility,
-making it possible to run many unmodified Linux applications
+kernel module provides limited Linux ABI (application binary interface)
+compatibility, making it possible to run many unmodified Linux applications
 without the need for virtualization or emulation.
 Some of the facilities provided are:
 .Bl -bullet
 .It
 Linux to native system call translation
 .It
 Linux-specific system calls
 .It
 Special signal handling for Linux processes
 .It
 Path translation mechanism
 .It
 Linux-specific virtual file systems
 .El
 .Pp
 The path translation mechanism makes Linux processes look up file paths
 under
 .Va emul_path
 (defaulting to
 .Pa /compat/linux )
 before
 .Pa / .
 For example, when Linux process attempts to open
 .Pa /etc/passwd ,
 it will really access
 .Pa /compat/linux/etc/passwd ,
 unless the latter does not exist.
 This is used to make sure Linux processes load Linux shared libraries
 instead of their similarly-named FreeBSD counterparts, and also
 to provide alternative versions of certain other files and virtual
 file systems.
 .Pp
 To install Linux shared libraries and system files into
 .Pa /compat/linux ,
-use the
+either use the
 .Pa emulators/linux_base-c7
-port or the
-.Dv linux_base-c7
-package.
+port or package,
+or
+.Xr debootstrap 8
+installed from
+.Pa sysutils/debootstrap .
 .Pp
 To avoid mounting Linux-specific filesystems at startup, add the following
 line to the
 .Xr rc.conf 5
 file:
 .Pp
 .Dl linux_mounts_enable="NO"
 .Sh SYSCTL VARIABLES
 The following variables are available as both
 .Xr sysctl 8
 variables and
 .Xr loader 8
 tunables:
 .Bl -tag -width indent
 .It Va compat.linux.debug
 Enable debugging messages.
 Set to 0 to silence them.
 Defaults to 3.
 A setting of 1 prints debug messages, tells about unimplemented stuff (only
 once).
 Set to 2 is like 1, but also prints messages about implemented but not tested
 stuff (only once).
 Setting it to 3 or higher is like 2, but no rate limiting of messages.
 .It Va compat.linux.default_openfiles
 Default soft openfiles resource limit for Linux applications.
 Set to -1 to disable the limit.
 Defaults to 1024.
 .It Va compat.linux.emul_path
 Path to the Linux run-time environment.
 Defaults to
 .Pa /compat/linux .
 .It Va compat.linux.osname
 Linux kernel operating system name.
 Defaults to "Linux".
 .It Va compat.linux.osrelease
 Linux kernel operating system release.
 Changing this to something else is discouraged on non-development systems,
 because it may change the way Linux programs work.
 Some versions of GNU libc are known to use different syscalls depending
 on the value of this sysctl.
 .It Va compat.linux.oss_version
 Linux Open Sound System version.
 Defaults to 198144.
 .It Va compat.linux.preserve_vstatus
 When set to 1, it prevents Linux applications from resetting the
 .Xr termios 4
 VSTATUS setting.
 From a user perspective, this makes
 .Va SIGINFO
 work for Linux executables.
 Defaults to 0.
 .It Va compat.linux.setid_allowed
-Disable handling of set-user-ID and set-group-ID mode bits for the new
+Enable handling of set-user-ID and set-group-ID mode bits for the new
 process image file when image is to be executed under Linux ABI.
-When set, new Linux images always use credentials of the program
+When set to 0, new Linux images always use credentials of the program
 that issued the
 .Xr execve 2
 call, regardless of the image file mode.
-Defaults to 1.
-.Pp
 This might be reasonable or even required, because
 .Fx
-does not emulate Linux environment completely, and missed features
-could become holes.
+does not emulate the Linux environment completely, and missed features
+may result in security vulnerabilities.
+Defaults to 1.
 .El
 .Sh FILES
 .Bl -tag -width /compat/linux/dev/shm -compact
 .It Pa /compat/linux
 Linux run-time environment
 .It Pa /compat/linux/dev
 device file system, see
 .Xr devfs 5
 .It Pa /compat/linux/dev/fd
 file descriptor file system mounted with the
 .Cm linrdlnk
 option, see
 .Xr fdescfs 5
 .It Pa /compat/linux/dev/shm
 in-memory file system, see
 .Xr tmpfs 5
 .It Pa /compat/linux/proc
 Linux process file system, see
 .Xr linprocfs 5
 .It Pa /compat/linux/sys
 Linux kernel objects file system, see
 .Xr linsysfs 5
 .El
 .Sh SEE ALSO
 .Xr brandelf 1 ,
 .Xr pty 4 ,
 .Xr elf 5 ,
 .Xr fdescfs 5 ,
 .Xr linprocfs 5 ,
 .Xr linsysfs 5 ,
 .Xr tmpfs 5
 .Sh HISTORY
-Linux ABI support first appeared in
+Linux ABI support first appeared for i386 in
 .Fx 2.1 .
 Support for amd64 binaries first appeared in
 .Fx 10.3 .
 Support for arm64 binaries first appeared in
 .Fx 12.0 .
 .Sh BUGS
 Support for some of the Linux-specific system calls and system call arguments
 is missing.