Updated Docs and bumped version

Hopefully nearer 0.6
closes #368

docs/guide/document-instances.rst

@@ -35,13 +35,23 @@ already exist, then any changes will be updated atomically.  For example::
     * ``list_field.pop(0)`` - *sets* the resulting list
     * ``del(list_field)``   - *unsets* whole list
 
-To delete a document, call the :meth:`~mongoengine.Document.delete` method.
-Note that this will only work if the document exists in the database and has a
-valide :attr:`id`.
-
 .. seealso::
     :ref:`guide-atomic-updates`
 
+Cascading Saves
+---------------
+If your document contains :class:`~mongoengine.ReferenceField` or
+:class:`~mongoengine.GenericReferenceField` objects, then by default the
+:meth:`~mongoengine.Document.save` method will automatically save any changes to
+those objects as well.  If this is not desired passing :attr:`cascade` as False
+to the save method turns this feature off.
+
+Deleting documents
+------------------
+To delete a document, call the :meth:`~mongoengine.Document.delete` method.
+Note that this will only work if the document exists in the database and has a
+valid :attr:`id`.
+
 Document IDs
 ============
 Each document in the database has a unique id. This may be accessed through the