diff --git a/bson/__init__.py b/bson/__init__.py
index 3b013aab7..5891441ba 100644
--- a/bson/__init__.py
+++ b/bson/__init__.py
@@ -13,6 +13,55 @@
 # limitations under the License.
 
 """BSON (Binary JSON) encoding and decoding.
+
+The mapping from Python types to BSON types is as follows:
+
+=======================================  =============  ===================
+Python Type                              BSON Type      Supported Direction
+=======================================  =============  ===================
+None                                     null           both
+bool                                     boolean        both
+int [#int]_                              int32 / int64  py -> bson
+long                                     int64          py -> bson
+`bson.int64.Int64`                       int64          both
+float                                    number (real)  both
+string                                   string         py -> bson
+unicode                                  string         both
+list                                     array          both
+dict / `SON`                             object         both
+datetime.datetime [#dt]_ [#dt2]_         date           both
+`bson.regex.Regex`                       regex          both
+compiled re [#re]_                       regex          py -> bson
+`bson.binary.Binary`                     binary         both
+`bson.objectid.ObjectId`                 oid            both
+`bson.dbref.DBRef`                       dbref          both
+None                                     undefined      bson -> py
+unicode                                  code           bson -> py
+`bson.code.Code`                         code           py -> bson
+unicode                                  symbol         bson -> py
+bytes (Python 3) [#bytes]_               binary         both
+=======================================  =============  ===================
+
+Note that, when using Python 2.x, to save binary data it must be wrapped as
+an instance of `bson.binary.Binary`. Otherwise it will be saved as a BSON
+string and retrieved as unicode. Users of Python 3.x can use the Python bytes
+type.
+
+.. [#int] A Python int will be saved as a BSON int32 or BSON int64 depending
+   on its size. A BSON int32 will always decode to a Python int. A BSON
+   int64 will always decode to a :class:`~bson.int64.Int64`.
+.. [#dt] datetime.datetime instances will be rounded to the nearest
+   millisecond when saved
+.. [#dt2] all datetime.datetime instances are treated as *naive*. clients
+   should always use UTC.
+.. [#re] :class:`~bson.regex.Regex` instances and regular expression
+   objects from ``re.compile()`` are both saved as BSON regular expressions.
+   BSON regular expressions are decoded as :class:`~bson.regex.Regex`
+   instances.
+.. [#bytes] The bytes type from Python 3.x is encoded as BSON binary with
+   subtype 0. In Python 3.x it will be decoded back to bytes. In Python 2.x
+   it will be decoded to an instance of :class:`~bson.binary.Binary` with
+   subtype 0.
 """
 
 import calendar
diff --git a/bson/son.py b/bson/son.py
index dd5f0f64c..1039cb168 100644
--- a/bson/son.py
+++ b/bson/son.py
@@ -34,56 +34,8 @@ class SON(dict):
     """SON data.
 
     A subclass of dict that maintains ordering of keys and provides a
-    few extra niceties for dealing with SON. SON objects can be
-    converted to and from BSON.
-
-    The mapping from Python types to BSON types is as follows:
-
-    =======================================  =============  ===================
-    Python Type                              BSON Type      Supported Direction
-    =======================================  =============  ===================
-    None                                     null           both
-    bool                                     boolean        both
-    int [#int]_                              int32 / int64  py -> bson
-    long                                     int64          py -> bson
-    `bson.int64.Int64`                       int64          both
-    float                                    number (real)  both
-    string                                   string         py -> bson
-    unicode                                  string         both
-    list                                     array          both
-    dict / `SON`                             object         both
-    datetime.datetime [#dt]_ [#dt2]_         date           both
-    `bson.regex.Regex`                       regex          both
-    compiled re [#re]_                       regex          py -> bson
-    `bson.binary.Binary`                     binary         both
-    `bson.objectid.ObjectId`                 oid            both
-    `bson.dbref.DBRef`                       dbref          both
-    None                                     undefined      bson -> py
-    unicode                                  code           bson -> py
-    `bson.code.Code`                         code           py -> bson
-    unicode                                  symbol         bson -> py
-    bytes (Python 3) [#bytes]_               binary         both
-    =======================================  =============  ===================
-
-    Note that to save binary data it must be wrapped as an instance of
-    `bson.binary.Binary`. Otherwise it will be saved as a BSON string
-    and retrieved as unicode.
-
-    .. [#int] A Python int will be saved as a BSON int32 or BSON int64 depending
-       on its size. A BSON int32 will always decode to a Python int. A BSON
-       int64 will always decode to a :class:`~bson.int64.Int64`.
-    .. [#dt] datetime.datetime instances will be rounded to the nearest
-       millisecond when saved
-    .. [#dt2] all datetime.datetime instances are treated as *naive*. clients
-       should always use UTC.
-    .. [#re] :class:`~bson.regex.Regex` instances and regular expression
-       objects from ``re.compile()`` are both saved as BSON regular expressions.
-       BSON regular expressions are decoded as :class:`~bson.regex.Regex`
-       instances.
-    .. [#bytes] The bytes type from Python 3.x is encoded as BSON binary with
-       subtype 0. In Python 3.x it will be decoded back to bytes. In Python 2.x
-       it will be decoded to an instance of :class:`~bson.binary.Binary` with
-       subtype 0.
+    few extra niceties for dealing with SON. SON provides an API
+    similar to collections.OrderedDict from Python 2.7+.
     """
 
     def __init__(self, data=None, **kwargs):