-&$home$& variable are prepended, unless it is empty. In conventional
-configurations, this variable is normally set in a user filter to the user's
-home directory, but the system administrator may set it to some other path. In
-some configurations, &$home$& may be unset, in which case a non-absolute path
-name may be generated. Such configurations convert this to an absolute path
-when the delivery takes place. In a system filter, &$home$& is never set.
+&$home$& variable are prepended, unless it is empty, &new("or the system
+administrator has disabled this feature.") In conventional configurations, this
+variable is normally set in a user filter to the user's home directory, but the
+system administrator may set it to some other path. In some configurations,
+&$home$& may be unset, &new("or prepending may be disabled,") in which case a
+non-absolute path name may be generated. Such configurations convert this to an
+absolute path when the delivery takes place. In a system filter, &$home$& is
+never set.