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diff --git a/bin/kenv/kenv.1 b/bin/kenv/kenv.1
index 29260f0..9e5345d 100644
--- a/bin/kenv/kenv.1
+++ b/bin/kenv/kenv.1
@@ -67,8 +67,28 @@ If the
.Fl q
option is set, warnings normally printed as a result of being unable to
perform the requested operation will be suppressed.
+.Pp
+Variables can be added to the kernel environment using the
+.Xr /boot/oader.conf
+file, or also statically compiled into the kernel using the statement
+.Pp
+.Dl Ic env Ar filename
+.Pp
+in the kernel config file.
+The file can contain lines of the form
+.Pp
+.Dl name = "value" # this is a coment
+.Pp
+where whitespace around name and '=', and
+everything after a '#' character, are ignored. Almost any printable
+character except '=' is acceptable as part of a name. Quotes
+are optional and necessary only if the value contains
+whitespace.
+.Pp
.Sh SEE ALSO
.Xr kenv 2 ,
+.Xr config 5 ,
+.Xr loader.conf 5 ,
.Xr loader 8
.Sh HISTORY
The
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