Index: etc/defaults/rc.conf
===================================================================
--- etc/defaults/rc.conf	(revision 229271)
+++ etc/defaults/rc.conf	(working copy)
@@ -700,6 +700,22 @@
 #jail_example_fstab=""				# fstab(5) for mount/umount
 #jail_example_flags="-l -U root"		# flags for jail(8)
 
+# Examples of how to use the mdconfig rc scripts to...
+# 1) create a 1GB malloc backed SU disk, owned by root:wheel, and
+#    chmod'ed 0770.
+# 2) mount an existing uzip disk image with /md.uzip.
+# 3) populate a 10MB memory disk with files from /conf/base/etc .
+#
+#mdconfig_md0="-t malloc -s 1g"
+#mdconfig_md0_owner="root:wheel"
+#mdconfig_md0_perms="0770"
+#mdconfig_md0_newfs="-U"
+#mdconfig_md1="-t vnode -f /md.uzip"
+#mdconfig_md2="-t malloc -s 10m"
+#mdconfig_md2_files="/conf/base/etc"
+#
+# Please note that the above examples require fstab entries in order to work!
+
 ##############################################################
 ### Define source_rc_confs, the mechanism used by /etc/rc.* ##
 ### scripts to source rc_conf_files overrides safely.	    ##