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diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile
--- a/share/man/man9/Makefile
+++ b/share/man/man9/Makefile
@@ -204,6 +204,7 @@
kobj.9 \
kproc.9 \
kqueue.9 \
+ kstack_contains.9 \
kthread.9 \
ktr.9 \
lock.9 \
diff --git a/share/man/man9/kstack_contains.9 b/share/man/man9/kstack_contains.9
new file mode 100644
--- /dev/null
+++ b/share/man/man9/kstack_contains.9
@@ -0,0 +1,62 @@
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
+.\" Copyright (c) 2023 Joseph Koshy <jkoshy@FreeBSD.org>
+.\"
+.\" 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 2, 2023
+.Dt KSTACK_CONTAINS 9
+.Os
+.Sh NAME
+.Nm kstack_contains
+.Nd determine if an address range lies within the kernel stack for a thread
+.Sh SYNOPSIS
+.In machine/stack.h
+.Ft bool
+.Fn kstack_contains "struct thread *td" "vm_offset_t va" "size_t len"
+.Sh DESCRIPTION
+This function can be used to determine whether a given address range
+falls within the kernel stack for the thread pointed to by
+.Fa td .
+.Sh RETURN VALUES
+The function
+.Fn kstack_contains
+returns
+.Dv true
+if the range of addresses
+.Bo
+.Fa va Ns .. Ns (
+.Fa va Ns + Ns
+.Fa len Ns - Ns 1 )
+.Bc
+(both addresses inclusive) lies within the kernel stack for the thread
+pointed to by argument
+.Fa td ,
+or returns
+.Dv false
+otherwise.
+.Sh ERRORS
+This function does not return an error.
+.Sh SEE ALSO
+.Xr kproc 9 ,
+.Xr kthread 9

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