-comma separated options, same as in the **add** command. ``--disk``
-*N*``:add,size=``**SIZE** can be used to add a disk at a specific index.
-The ``--disk remove`` option will remove the last disk of the instance.
-Use ``--disk `` *N*``:remove`` to remove a disk by its index. The
-``--disk`` *N*``:mode=``*MODE* option will change the mode of the Nth
-disk of the instance between read-only (``ro``) and read-write (``rw``).
-
-The ``--net add:``*options* and ``--net`` *N*``:add,``*options* option
-will add a new network interface to the instance. The available options
-are the same as in the **add** command (``mac``, ``ip``, ``link``,
-``mode``, ``network``). The ``--net remove`` will remove the last network
-interface of the instance (``--net`` *N*``:remove`` for a specific index),
-while the ``--net`` *N*``:``*options* option will change the parameters of
-the Nth instance network interface.
+comma separated options, same as in the **add** command. -The ``--disk
+remove`` option will remove the last disk of the instance. Use ``--disk
+`` *ID*``:remove`` to remove a disk by its identifier. *ID* can be the
+index of the disk, the disks's name or the disks's UUID. The ``--disk
+*ID*:modify[,options...]`` will change the options of the disk.
+Available options are:
+
+mode
+ The access mode. Either ``ro`` (read-only) or the default ``rw`` (read-write).
+
+name
+ This option specifies a name for the disk, which can be used as a disk
+ identifier. An instance can not have two disks with the same name.
+
+The ``--net *N*:add[,options..]`` will add a new network interface to
+the instance. The available options are the same as in the **add**
+command (``mac``, ``ip``, ``link``, ``mode``, ``network``). The
+``--net *ID*,remove`` will remove the intances' NIC with *ID* identifier,
+which can be the index of the NIC, the NIC's name or the NIC's UUID.
+The ``--net *ID*:modify[,options..]`` option will change the parameters of
+the instance network interface with the *ID* identifier.