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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
@@ -90,6 +90,7 @@
DECLARE_MODULE.9 \
DEFINE_IFUNC.9 \
DELAY.9 \
+ deadfs.9 \
devclass.9 \
devclass_find.9 \
devclass_get_device.9 \
diff --git a/share/man/man9/deadfs.9 b/share/man/man9/deadfs.9
new file mode 100644
--- /dev/null
+++ b/share/man/man9/deadfs.9
@@ -0,0 +1,38 @@
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
+.\" Copyright (c) 2025 Mateusz Piotrowski <0mp@FreeBSD.org>
+.\"
+.Dd October 24, 2025
+.Dt DEADFS 9
+.Os
+.Sh NAME
+.Nm deadfs
+.Nd file system for rejected vnodes
+.Sh DESCRIPTION
+The
+.Nm
+file system implements operations that do not modify any data
+and instead return indications of invalid IO.
+Its role is to provide a fallback vnode operations vector for
+.Xr revoke 2 Ap d ,
+non-existent, or otherwise invalid file descriptors and
+.Xr vnode 9 Ap s .
+.Pp
+It is a kernel-only file system and so cannot be mounted from userspace.
+.Sh SEE ALSO
+.Xr revoke 2 ,
+.Xr insmntque 9 ,
+.Xr vnode 9
+.Sh HISTORY
+UNIX System Manager's Manual (SMM) for
+.Bx 4.4
+described
+.Nm
+as a file system
+.Dq where rejected vnods go to die .
+.Sh AUTHORS
+The
+.Nm
+manual page was written by
+.An Mateusz Piotrowski Aq Mt 0mp@FreeBSD.org .

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