Index: rc.conf.5
===================================================================
--- rc.conf.5	(revision 211847)
+++ rc.conf.5	(working copy)
@@ -1128,6 +1128,19 @@
 variables.
 .Pp
 If a
+.Va ifconfig_ Ns Ao Ar interface Ac Ns Va _descr
+variable is set, the interface would be assigned the description
+specified by the variable.
+.Pp
+To assign an description of
+.Dq Uplink to Gigabit Switch 1
+on the interface named
+.Li em0 :
+.Bd -literal
+ifconfig_em0_descr="Uplink to Gigabit Switch 1"
+.Ed
+.Pp
+If a
 .Va vlans_ Ns Aq Ar interface
 variable is set,
 a