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diff --git a/stand/man/loader.8 b/stand/man/loader.8
--- a/stand/man/loader.8
+++ b/stand/man/loader.8
@@ -261,6 +261,70 @@
.It Va pcibios.maxbus
The highest PCI bus number the PCI BIOS reported.
.El
+.Pp
+The following variables are used on the Open Firmware loader on
+powerpc:
+.Bl -tag -width indent -compact
+.It Va cas
+.Pq powerpc64 only
+Controls whether
+.Nm
+performs the PAPR
+.Dq client-architecture-support
+negotiation with pSeries/PowerVM firmware on startup.
+Set automatically; defaults to enabled where CAS is supported.
+.It Va radix_mmu
+.Pq powerpc64 only
+Set by
+.Nm
+to
+.Dq Li 0
+when the firmware did not agree to Radix MMU support during CAS
+negotiation, so the kernel does not try to use it and panic.
+Can be set to
+.Dq Li 0
+ahead of time to force the kernel to use the Hash MMU instead.
+.It Va usefdt
+Controls whether
+.Nm
+passes a flattened device tree to the kernel, instead of Open
+Firmware client interface pointers.
+Set automatically on non-Apple hardware
+.Pq real-mode Open Firmware ,
+where FDT data is reliable.
+.El
+.Pp
+The following variable is used on the U-Boot loader:
+.Bl -tag -width indent -compact
+.It Va fdt_file
+Name of the flattened device tree file to load.
+Checked before falling back to U-Boot's own
+.Va fdtfile
+or
+.Va fdt_file
+environment variables.
+.El
+.Pp
+The following variables are used on the Linux-hosted
+.Pq kboot
+loader:
+.Bl -tag -width indent -compact
+.It Va bootdev
+Overrides the device
+.Nm
+boots from.
+If unset, the boot device is auto-probed.
+.It Va hostdisk_override
+Restricts host disk enumeration to a single, given host device node,
+instead of probing every block device visible to the host Linux
+kernel.
+.It Va hostfs_root
+The path, in the host Linux filesystem, that
+.Nm
+treats as its root.
+Defaults to
+.Pa / .
+.El
.Sh SEE ALSO
.Xr libsa 3 ,
.Xr loader.conf 5 ,

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