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D59972.id187576.diff
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diff --git a/stand/man/loader_simp.8 b/stand/man/loader_simp.8
--- a/stand/man/loader_simp.8
+++ b/stand/man/loader_simp.8
@@ -796,6 +796,37 @@
refers to a ZFS filesystem, then
.Nm
will instruct kernel to use that filesystem as the root filesystem.
+.Pp
+Booting from, or switching to, a ZFS Boot Environment sets a handful
+of variables to track the active BE and drive the boot environment
+menu; these are set automatically and are not normally set by hand.
+.Bl -tag -width bootfile
+.It Va zfs_be_active
+The
+.Va currdev
+in effect at boot, with the trailing colon removed.
+.It Va zfs_be_root
+The boot environment root dataset
+.Pq without a trailing boot environment name
+that
+.Ic reloadbe ,
+.Ic be-list ,
+and
+.Ic be-switch
+operate on.
+.It Va zfs_be_currpage
+.It Va zfs_be_pages
+The current page number, and total number of pages, of boot
+environments, for interpreters that page the boot environment menu.
+.It Va bootenv_root Ns Bq N
+.It Va bootenvmenu_caption Ns Bq N
+.It Va bootenvansi_caption Ns Bq N
+.It Va bootenvmenu_command Ns Bq N
+Internal, indexed variables populated by
+.Ic reloadbe
+to describe each boot environment menu slot on the current page.
+Not meant to be set directly.
+.El
.Ss NETWORK BOOT VARIABLES
When
.Nm
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