[v4_1_esv] Add description of prepending the universe name to environment variables

diff --git a/client/dhclient-script.8 b/client/dhclient-script.8
index 16135d4476f93754e9d20caca3736406e9809e41..80090ece4e41d5fc2da55cbc088f79e8ed73fe4f 100644 (file)
--- a/client/dhclient-script.8
+++ b/client/dhclient-script.8
@@ -1,6 +1,6 @@
 .\"    dhclient-script.8
 .\"
-.\" Copyright (c) 2012,2014 by Internet Systems Consortium, Inc. ("ISC")
+.\" Copyright (c) 2012,2014,2016 by Internet Systems Consortium, Inc. ("ISC")
 .\" Copyright (c) 2009-2010 by Internet Systems Consortium, Inc. ("ISC")
 .\" Copyright (c) 2004-2005 by Internet Systems Consortium, Inc. ("ISC")
 .\" Copyright (c) 1996-2003 by Internet Software Consortium
@@ -123,10 +123,12 @@ options acquired from the server are passed using the option name
 described in \fBdhcp-options\fR, except that dashes (\'-\') are replaced
 by underscores (\'_\') in order to make valid shell variables, and the
 variable names start with new_.   So for example, the new subnet mask
-would be passed in $new_subnet_mask.  The options that the client
+would be passed in $new_subnet_mask.  Options from a non-default
+universe will have the universe name prepended to the option name, for
+example new_dhcp6_server_id.  The options that the client
 explicitly requested via a PRL or ORO option are passed with the same
 option name as above but prepended with requested_ and with a value of 1,
-or example requested_subnet_mask=1.  No such variable is defined for
+for example requested_subnet_mask=1.  No such variable is defined for
 options not requested by the client or options that don't require a
 request option, such as the ip address (*_ip_address) or expiration
 time (*_expiry).