diff --git a/mongoengine/base.py b/mongoengine/base.py
index 8d0c470b..6a94670e 100644
--- a/mongoengine/base.py
+++ b/mongoengine/base.py
@@ -43,6 +43,8 @@ def get_document(name):
 class BaseField(object):
     """A base class for fields in a MongoDB document. Instances of this class
     may be added to subclasses of `Document` to define a document's schema.
+
+    .. versionchanged:: 0.5 - added verbose and help text
     """
 
     # Fields may have _types inserted into indexes by default
@@ -156,6 +158,8 @@ class ComplexBaseField(BaseField):
     Allows for nesting of embedded documents inside complex types.
     Handles the lazy dereferencing of a queryset by lazily dereferencing all
     items in a list / dict rather than one at a time.
+
+    .. versionadded:: 0.5
     """
 
     field = None
@@ -896,7 +900,6 @@ class BaseDocument(object):
         return not self.__eq__(other)
 
     def __hash__(self):
-        """ For list, dict key  """
         if self.pk is None:
             # For new object
             return super(BaseDocument,self).__hash__()
diff --git a/mongoengine/document.py b/mongoengine/document.py
index bd2bbda4..3ccc4ddc 100644
--- a/mongoengine/document.py
+++ b/mongoengine/document.py
@@ -130,6 +130,11 @@ class Document(BaseDocument):
                 which will be used as options for the resultant ``getLastError`` command.
                 For example, ``save(..., w=2, fsync=True)`` will wait until at least two servers
                 have recorded the write and will force an fsync on each server being written to.
+
+        .. versionchanged:: 0.5
+            In existing documents it only saves changed fields using set / unset
+            Saves are cascaded and any :class:`~pymongo.dbref.DBRef` objects
+            that have changes are saved as well.
         """
         from fields import ReferenceField, GenericReferenceField
 
@@ -226,6 +231,11 @@ class Document(BaseDocument):
         signals.post_delete.send(self.__class__, document=self)
 
     def select_related(self, max_depth=1):
+        """Handles dereferencing of :class:`~pymongo.dbref.DBRef` objects to
+        a maximum depth in order to cut down the number queries to mongodb.
+
+        .. versionadded:: 0.5
+        """
         from dereference import dereference
         self._data = dereference(self._data, max_depth)
         return self
diff --git a/mongoengine/fields.py b/mongoengine/fields.py
index 619b8c60..0514f1f4 100644
--- a/mongoengine/fields.py
+++ b/mongoengine/fields.py
@@ -279,7 +279,6 @@ class DateTimeField(BaseField):
                     return None
 
 
-
 class ComplexDateTimeField(StringField):
     """
     ComplexDateTimeField handles microseconds exactly instead of rounding
@@ -295,6 +294,8 @@ class ComplexDateTimeField(StringField):
     Where NNNNNN is the number of microseconds of the represented `datetime`.
     The `,` as the separator can be easily modified by passing the `separator`
     keyword when initializing the field.
+
+    .. versionadded:: 0.5
     """
 
     def __init__(self, separator=',', **kwargs):
@@ -478,6 +479,7 @@ class DictField(ComplexBaseField):
     similar to an embedded document, but the structure is not defined.
 
     .. versionadded:: 0.3
+    .. versionchanged:: 0.5 - Can now handle complex / varying types of data
     """
 
     def __init__(self, basecls=None, field=None, *args, **kwargs):
@@ -542,6 +544,8 @@ class ReferenceField(BaseField):
       * NULLIFY     - Updates the reference to null.
       * CASCADE     - Deletes the documents associated with the reference.
       * DENY        - Prevent the deletion of the reference object.
+
+    .. versionchanged:: 0.5 added `reverse_delete_rule`
     """
 
     def __init__(self, document_type, reverse_delete_rule=DO_NOTHING, **kwargs):
@@ -708,6 +712,7 @@ class GridFSProxy(object):
     """Proxy object to handle writing and reading of files to and from GridFS
 
     .. versionadded:: 0.4
+    .. versionchanged:: 0.5 - added optional size param to read
     """
 
     def __init__(self, grid_id=None, key=None, instance=None):
@@ -800,6 +805,7 @@ class FileField(BaseField):
     """A GridFS storage field.
 
     .. versionadded:: 0.4
+    .. versionchanged:: 0.5 added optional size param for read
     """
 
     def __init__(self, **kwargs):
diff --git a/mongoengine/queryset.py b/mongoengine/queryset.py
index bade2b4c..a830150a 100644
--- a/mongoengine/queryset.py
+++ b/mongoengine/queryset.py
@@ -346,7 +346,10 @@ class QuerySet(object):
         self._hint = -1  # Using -1 as None is a valid value for hint
 
     def clone(self):
-        """Creates a copy of the current :class:`~mongoengine.queryset.QuerySet`"""
+        """Creates a copy of the current :class:`~mongoengine.queryset.QuerySet`
+
+        .. versionadded:: 0.5
+        """
         c = self.__class__(self._document, self._collection_obj)
 
         copy_props = ('_initial_query', '_query_obj', '_where_clause',
@@ -996,6 +999,8 @@ class QuerySet(object):
 
         Hinting will not do anything if the corresponding index does not exist.
         The last hint applied to this cursor takes precedence over all others.
+
+        .. versionadded:: 0.5
         """
         self._cursor.hint(index)
         self._hint = index
@@ -1038,11 +1043,12 @@ class QuerySet(object):
     def only(self, *fields):
         """Load only a subset of this document's fields. ::
 
-            post = BlogPost.objects(...).only("title")
+            post = BlogPost.objects(...).only("title", "author.name")
 
         :param fields: fields to include
 
         .. versionadded:: 0.3
+        .. versionchanged:: 0.5 - Added subfield support
         """
         fields = dict([(f, QueryFieldList.ONLY) for f in fields])
         return self.fields(**fields)
@@ -1053,6 +1059,8 @@ class QuerySet(object):
             post = BlogPost.objects(...).exclude("comments")
 
         :param fields: fields to exclude
+
+        .. versionadded:: 0.5
         """
         fields = dict([(f, QueryFieldList.EXCLUDE) for f in fields])
         return self.fields(**fields)
@@ -1098,6 +1106,8 @@ class QuerySet(object):
         """Include all fields. Reset all previously calls of .only() and .exclude(). ::
 
             post = BlogPost.objects(...).exclude("comments").only("title").all_fields()
+
+        .. versionadded:: 0.5
         """
         self._loaded_fields = QueryFieldList(always_include=self._loaded_fields.always_include)
         return self
@@ -1153,6 +1163,8 @@ class QuerySet(object):
         """Enable or disable snapshot mode when querying.
 
         :param enabled: whether or not snapshot mode is enabled
+
+        ..versionchanged:: 0.5 - made chainable
         """
         self._snapshot = enabled
         return self
@@ -1161,6 +1173,8 @@ class QuerySet(object):
         """Enable or disable the default mongod timeout when querying.
 
         :param enabled: whether or not the timeout is used
+
+        ..versionchanged:: 0.5 - made chainable
         """
         self._timeout = enabled
         return self
@@ -1404,6 +1418,8 @@ class QuerySet(object):
         .. note:: When using this mode of query, the database will call your
                   function, or evaluate your predicate clause, for each object
                   in the collection.
+
+        .. versionadded:: 0.5
         """
         where_clause = self._sub_js_fields(where_clause)
         self._where_clause = where_clause
@@ -1414,6 +1430,9 @@ class QuerySet(object):
 
         :param field: the field to sum over; use dot-notation to refer to
             embedded document fields
+
+        .. versionchanged:: 0.5 - updated to map_reduce as db.eval doesnt work
+            with sharding.
         """
         map_func = pymongo.code.Code("""
             function() {
@@ -1441,6 +1460,9 @@ class QuerySet(object):
 
         :param field: the field to average over; use dot-notation to refer to
             embedded document fields
+
+        .. versionchanged:: 0.5 - updated to map_reduce as db.eval doesnt work
+            with sharding.
         """
         map_func = pymongo.code.Code("""
             function() {
@@ -1472,7 +1494,6 @@ class QuerySet(object):
         else:
             return 0
 
-
     def item_frequencies(self, field, normalize=False, map_reduce=True):
         """Returns a dictionary of all items present in a field across
         the whole queried set of documents, and their corresponding frequency.
@@ -1490,6 +1511,9 @@ class QuerySet(object):
         :param field: the field to use
         :param normalize: normalize the results so they add to 1.0
         :param map_reduce: Use map_reduce over exec_js
+
+        .. versionchanged:: 0.5 defaults to map_reduce and can handle embedded
+                            document lookups
         """
         if map_reduce:
             return self._item_frequencies_map_reduce(field, normalize=normalize)
@@ -1532,7 +1556,7 @@ class QuerySet(object):
 
         if normalize:
             count = sum(frequencies.values())
-            frequencies = dict([(k, v/count) for k,v in frequencies.items()])
+            frequencies = dict([(k, v / count) for k, v in frequencies.items()])
 
         return frequencies
 
@@ -1594,9 +1618,15 @@ class QuerySet(object):
         return repr(data)
 
     def select_related(self, max_depth=1):
+        """Handles dereferencing of :class:`~pymongo.dbref.DBRef` objects to
+        a maximum depth in order to cut down the number queries to mongodb.
+
+        .. versionadded:: 0.5
+        """
         from dereference import dereference
         return dereference(self, max_depth=max_depth)
 
+
 class QuerySetManager(object):
 
     get_queryset = None