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diff --git a/usr.sbin/acpi/acpidump/acpidump.8 b/usr.sbin/acpi/acpidump/acpidump.8
--- a/usr.sbin/acpi/acpidump/acpidump.8
+++ b/usr.sbin/acpi/acpidump/acpidump.8
@@ -27,7 +27,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd June 29, 2020
+.Dd October 5, 2024
.Dt ACPIDUMP 8
.Os
.Sh NAME
@@ -36,11 +36,11 @@
.Sh SYNOPSIS
.Nm
.Op Fl d
-.Op Fl t
-.Op Fl h
-.Op Fl v
.Op Fl f Ar dsdt_input
+.Op Fl h
.Op Fl o Ar dsdt_output
+.Op Fl t
+.Op Fl v
.Sh DESCRIPTION
The
.Nm
@@ -88,38 +88,74 @@
and their header has a common format which consists of items
such as Signature, Length, Revision, Checksum, OEMID, OEM Table ID,
OEM Revision, Creator ID and Creator Revision.
+.Pp
When invoked with the
.Fl t
flag, the
.Nm
-utility dumps contents of the following tables:
+utility dumps contents of all the ACPI tables, except the DSDT and SSDT.
+The following SDTs are reported in detail, while the remainder will only report
+the common header information:
.Pp
.Bl -tag -offset indent -width 12345 -compact
-.It BERT
-.It DMAR
-.It DSDT
-.It ECDT
-.It EINJ
-.It ERST
-.It FACS
-.It FADT
-.It HEST
-.It HPET
-.It LPIT
-.It MADT
-.It MCFG
-.It NFIT
+.It BERT Boot Error Record Table
+Reports any previous boot errors.
+.It DMAR DMA Remapping Table
+Contains information about the DMA Remapping necessary for the system
+for I/O virtualization on Intel CPUS.
+.It DSDT Differentiated System Description Table
+Contais the main AML for the system.
+.It ECDT Embedded Controller Boot Resources Table
+Contains information about accessing the embedded controller
+prior to the OS decoding the DSDT for all its details.
+.It EINJ Error Injection Table
+Use to inject hardware errors to the error reporting mechanisms.
+.It ERST Error Record Serialization Table
+Information to retrieve and manage errors reported from the hardware.
+.It FACS Firmware ACPI Control Structure
+Information for the OS to interact with the firmware for things
+like suspend / resume and prevent mutual access to resources
+shared between the OS and the firmware.
+.It FACP Fixed ACPI Description Table (FADT)
+.It HEST Hardware Error Source Table
+Describes the possible sources of hardware errors to the OS.
+.It HPET High Precision Event Timer Table
+Describes the high precision timers in the system
+.It IVRS I/O Virtualization Reporting Structure
+Information for hypvervisors to use to share I/O resources on AMD
+processors.
+.It LPIT Low Power Idle Table
+Power management information for reducing power usage of the system.
+.It MADT Multiple APIC Description Table
+Describes all the Advanced Programmable Interrupt Controllers and
+Intel Streamlined Advanced Programmable Interrupt Controller present
+in the system.
+.It MCFG PCI Express Memory-mapped Configuration
+PCI config space base address register.
+.It NFIT NVDIMM Firmware Interface Table
+NVDIMM information in the system.
.It RSD PTR
-.It RSDT
-.It SLIT
-.It SRAT
-.It TCPA
-.It TPM2
-.It WDDT
+Pointer to rhe RSDT.
+.It RSDT Root System Description Table
+An array of physical pointers to other system description tables,
+the FACP (Fixed ACPI Description Table).
+.It SLIT System Locality Distance Information Table
+Provides information about the cost of communicating between different
+parts of the system (NUMA).
+.It SPCR Serial Port Console Redirection
+Contains informatiom about any serial port that the firmware used as
+a reporting console.
+.It SRAT System Resource Affinity Table
+Defines the domains of locality in the system for processors, memory
+and generic initiators (eg PCIe root complexes).
+.It TCPA Trusted Computing Platform Alliance
+Information about the TPM elements of the system.
+.It TPM2 Trusted Platform Module 2
+Additional information about newer TPM hardware.
+.It WDDT Watchdog Timer Description Table
+Information about how to manage watchdog timers in the system.
.El
.Pp
-The RSDT contains a pointer to the physical memory address of the FACP
-(Fixed ACPI Description Table).
The FACP defines static system information about power management support
(ACPI Hardware Register Implementation)
such as interrupt mode (INT_MODEL),

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