Describe who's --lookup option.

diff --git a/doc/sh-utils.texi b/doc/sh-utils.texi
index 556f0aea9e01596212c7e2b39ac2bb78c65b3072..488cded5bf77b4d11bb9cfaf5fb797a804c6390d 100644 (file)
--- a/doc/sh-utils.texi
+++ b/doc/sh-utils.texi
@@ -2038,6 +2038,14 @@ After the login time, print the number of hours and minutes that the
 user has been idle.  @samp{.} means the user was active in last minute.
 @samp{old} means the user was idle for more than 24 hours.
 
+@item -l
+@itemx --lookup
+@opindex -l
+@opindex --lookup
+Attempt to canonicalize hostnames found in utmp through a DNS lookup.  This
+is not the default because it can cause significant delays on systems with
+automatic dial-up internet access.
+
 @item -H
 @itemx --heading
 @opindex -H