diff --git a/cddl/usr.bin/ctfmerge/ctfmerge.1 b/cddl/usr.bin/ctfmerge/ctfmerge.1
index 2bc70db82dc9..1e371e62c9c5 100644
--- a/cddl/usr.bin/ctfmerge/ctfmerge.1
+++ b/cddl/usr.bin/ctfmerge/ctfmerge.1
@@ -1,119 +1,141 @@
 .\"
-.\" Copyright (c) 2010 The FreeBSD Foundation 
-.\" All rights reserved. 
-.\" 
+.\" Copyright (c) 2010 The FreeBSD Foundation
+.\" All rights reserved.
+.\"
 .\" This software was developed by Rui Paulo under sponsorship from the
-.\" FreeBSD Foundation. 
-.\"  
-.\" 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 Foundation.
+.\"
+.\" 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.
 .\"
-.Dd April 21, 2022
+.\" 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.
+.\"
+.Dd June 30, 2026
 .Dt CTFMERGE 1
 .Os
 .Sh NAME
 .Nm ctfmerge
 .Nd merge several CTF data sections into one
 .Sh SYNOPSIS
 .Nm
 .Op Fl fgstv
 .Fl l Ar label
 .Fl L Ar labelenv
 .Fl o Ar outfile
 file ...
 .Nm
 .Op Fl fgstv
 .Fl l Ar label
 .Fl L Ar labelenv
 .Fl o Ar outfile
 .Fl d Ar uniqfile
 .Op Fl g
 .Op Fl D Ar uniqlabel
 file ...
 .Nm
 .Op Fl fgstv
 .Fl l Ar label
 .Fl L Ar labelenv
 .Fl o Ar outfile
 .Fl w Ar withfile
 file ...
 .Nm
 .Op Fl g
 .Fl c Ar srcfile
 .Ar destfile
 .Sh DESCRIPTION
 The
 .Nm
 utility merges several CTF (Compact C Type Format) data sections from several
 files into one output file, unifying common data.
 .Pp
 The following options are available:
 .Bl -tag -width indent
 .It Fl f
 Match global symbols to global CTF data.
 .It Fl g
 Don't delete the original debugging sections.
 .It Fl s
 Use the .dynsym ELF section instead of the .symtab ELF section.
 .It Fl t
 Make sure that all object files have a CTF section.
 .It Fl v
 Enable verbose mode.
 .It Fl l Ar label
 Sets the label as
 .Ar label .
 .It Fl L Ar labelenv
 Instructs
 .Nm
 to read the label from the environment variable
 .Ar labelenv .
 .It Fl o Ar outfile
 Use
 .Ar outfile
 to store the merged CTF data.
 .It Fl d Ar uniqfile
 Uniquify against
 .Ar uniqfile .
 .It Fl d Ar uniqlabel
 Uniquify against label
 .Ar uniqlabel
 .It Fl w Ar withfile
 Additive merge with
 .Ar withfile .
 .It Fl c Ar srcfile Ar destfile
 Copy CTF data from
 .Ar srcfile
 into
 .Ar destfile .
 .El
+.Sh ENVIRONMENT
+The following environment variables are used by
+.Nm :
+.Bl -tag -width "CTFMERGE_TERMINATE_NO_UNLINK"
+.It Ev CTFMERGE_DEBUG_LEVEL
+Increase debugging verbosity
+.Pq maximum 3 .
+.It Ev CTFMERGE_INPUT_THROTTLE
+Max queue size to queue
+.Pq default 10 .
+.It Ev CTFMERGE_PHASE1_BATCH_SIZE
+Number of files in a slot that are needed before processing starts
+.Pq default 8 .
+.It Ev CTFMERGE_MAX_SLOTS
+Number of round-robin slots in the input queue that is processed by
+worker threads.
+Each slot represents a file batch
+.Pq default 5 .
+.It Ev CTFMERGE_TERMINATE_NO_UNLINK
+Do not remove temporary files on exit,
+so that they can be examined for debugging.
+.El
 .Sh EXIT STATUS
 .Ex -std
 .Sh SEE ALSO
 .Xr ctfconvert 1 ,
 .Xr ctfdump 1 ,
 .Xr ctf 5
 .Sh HISTORY
 The
 .Nm
 utility first appeared in
 .Fx 7.0 .
 .Sh AUTHORS
 The CTF utilities came from OpenSolaris.