diff --git a/lib/libsys/thr_kill.2 b/lib/libsys/thr_kill.2
index 3252de13ed8c..63a6e40ef6fc 100644
--- a/lib/libsys/thr_kill.2
+++ b/lib/libsys/thr_kill.2
@@ -1,137 +1,137 @@
 .\" Copyright (c) 2016 The FreeBSD Foundation, Inc.
 .\"
 .\" This documentation was written by
 .\" Konstantin Belousov <kib@FreeBSD.org> 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 AUTHORS 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 AUTHORS 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 May 5, 2020
-.Dt THR_kill 2
+.Dt THR_KILL 2
 .Os
 .Sh NAME
 .Nm thr_kill
 .Nd send signal to thread
 .Sh LIBRARY
 .Lb libc
 .Sh SYNOPSIS
 .In sys/thr.h
 .Ft int
 .Fn thr_kill "long id" "int sig"
 .Ft int
 .Fn thr_kill2 "pid_t pid" "long id" "int sig"
 .Sh DESCRIPTION
 The
 .Fn thr_kill
 and
 .Fn thr_kill2
 system calls allow sending a signal, specified by the
 .Fa sig
 argument, to some threads in a process.
 For the
 .Fn thr_kill
 function, signalled threads are always limited to the current process.
 For the
 .Fn thr_kill2
 function, the
 .Fa pid
 argument specifies the process with threads to be signalled.
 .Pp
 The
 .Fa id
 argument specifies which threads get the signal.
 If
 .Fa id
 is equal to \-1, all threads in the specified process are signalled.
 Otherwise, only the thread with the thread identifier equal to the
 argument is signalled.
 .Pp
 The
 .Fa sig
 argument defines the delivered signal.
 It must be a valid signal number or zero.
 In the latter case no signal is actually sent, and the call is used to
 verify the liveness of the thread.
 .Pp
 The signal is delivered with
 .Dv siginfo
 .Dv si_code
 set to
 .Dv SI_LWP .
 .Sh RETURN VALUES
 If successful,
 .Fn thr_kill
 and
 .Fn thr_kill2
 will return zero, otherwise \-1 is returned, and
 .Va errno
 is set to indicate the error.
 .Sh ERRORS
 The
 .Fn thr_kill
 and
 .Fn thr_kill2
 operations return the following errors:
 .Bl -tag -width Er
 .It Bq Er EINVAL
 The
 .Fa sig
 argument is not zero and does not specify valid signal.
 .It Bq Er ESRCH
 The specified process or thread was not found.
 .El
 .Pp
 Additionally, the
 .Fn thr_kill2
 may return the following errors:
 .Bl -tag -width Er
 .It Bq Er EPERM
 The current process does not have sufficient privilege to check existence or
 send a signal to the specified process.
 .El
 .Sh SEE ALSO
 .Xr _umtx_op 2 ,
 .Xr kill 2 ,
 .Xr thr_exit 2 ,
 .Xr thr_new 2 ,
 .Xr thr_self 2 ,
 .Xr thr_set_name 2 ,
 .Xr pthread_kill 3 ,
 .Xr signal 3
 .Sh STANDARDS
 The
 .Fn thr_kill
 and
 .Fn thr_kill2
 system calls are non-standard and are used by the
 .Lb libthr
 to implement
 .St -p1003.1-2001
 .Xr pthread 3
 functionality.
 .Sh HISTORY
 The
 .Fn thr_kill
 and
 .Fn thr_kill2
 system calls first appeared in
 .Fx 5.2 .