+\fIalias\fR <name> <devlink>
+Maps a device link in the /dev directory hierarchy to a new device
+name. The udev rule defining the device link must have run prior to
+.BR vdev_id (8).
+A defined alias takes precedence over a topology-derived name, but the
+two naming methods can otherwise coexist. For example, one might name
+drives in a JBOD with the sas_direct topology while naming an internal
+L2ARC device with an alias.
+
+\fIname\fR - the name of the link to the device that will by created in
+/dev/disk/by-vdev.
+
+\fIdevlink\fR - the name of the device link that has already been
+defined by udev. This may be an absolute path or the base filename.
+
+.TP