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+CloudSigma
+==========
+
+This datasource finds metadata and user-data from the `CloudSigma`_ cloud
+platform.  Data transfer occurs through a virtual serial port of the
+`CloudSigma`_'s VM and the presence of network adapter is **NOT** a
+requirement, See `server context`_ in the public documentation for more
+information.
+
+
+Setting a hostname
+------------------
+By default the name of the server will be applied as a hostname on the first
+boot.
+
+
+Providing user-data
+-------------------
+
+You can provide user-data to the VM using the dedicated `meta field`_ in the
+`server context`_ ``cloudinit-user-data``. By default *cloud-config* format is
+expected there and the ``#cloud-config`` header could be omitted. However
+since this is a raw-text field you could provide any of the valid `config
+formats`_.
+
+You have the option to encode your user-data using Base64. In order to do that
+you have to add the ``cloudinit-user-data`` field to the ``base64_fields``.
+The latter is a comma-separated field with all the meta fields whit base64
+encoded values.
+
+If your user-data does not need an internet connection you can create a `meta
+field`_ in the `server context`_ ``cloudinit-dsmode`` and set "local" as
+value.  If this field does not exist the default value is "net".
+
+
+.. _CloudSigma: http://cloudsigma.com/
+.. _server context: http://cloudsigma-docs.readthedocs.org/en/latest/server_context.html
+.. _meta field: http://cloudsigma-docs.readthedocs.org/en/latest/meta.html
+.. _config formats: http://cloudinit.readthedocs.org/en/latest/topics/format.html
+.. vi: textwidth=78