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+Advanced usage
+===============
+
+Packer
+------
+
+autoreset
+~~~~~~~~~
+
+When you used ``autoreset=False`` option of :class:`~msgpack.Packer`, 
+``pack()`` method doesn't return packed ``bytes``.
+
+You can use :meth:`~msgpack.Packer.bytes` or :meth:`~msgpack.Packer.getbuffer` to
+get packed data.
+
+``bytes()`` returns ``bytes`` object.  ``getbuffer()`` returns some bytes-like
+object.  It's concrete type is implement detail and it will be changed in future
+versions.
+
+You can reduce temporary bytes object by using ``Unpacker.getbuffer()``.
+
+.. code-block:: python
+
+    packer = Packer(use_bin_type=True, autoreset=False)
+
+    packer.pack([1, 2])
+    packer.pack([3, 4])
+
+    with open('data.bin', 'wb') as f:
+        f.write(packer.getbuffer())
+
+    packer.reset()  # reset internal buffer