Knsupdate with libedit

doc/man/kzonesign.1in

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 .SH DESCRIPTION
 .sp
 This utility reads the zone\(aqs zone file, signs the zone according to given
-configuration, and writes the signed zone file back.
+configuration, and writes the signed zone file back. An alternative mode
+is DNSSEC validation of the given zone. The signing or validation
+can run in parallel if enabled in the configuration (see policy.signing\-threads
+and zone.adjust\-threads).
 .SS Config options
 .INDENT 0.0
 .TP