Documentation about new support for binary objects improved

NEWS

@@ -4,8 +4,9 @@ What's new in psycopg 2.4
 * New features and changes:
 
   - Added support for Python 3.1 and 3.2.
-  - Adapt types 'bytearray' (from Python 2.6) and 'memoryview' (from Python
+  - Adapt types 'bytearray' (from Python 2.6), 'memoryview' (from Python 2.7)
-    2.7) to bytea data type.
+    and other objects implementing the 'Revised Buffer Protocol' to bytea data
+    type.
   - Added `register_composite()` function to cast PostgreSQL composite types
     into Python tuples/namedtuples.
   - More efficient iteration on named cursors.

doc/src/usage.rst

@@ -254,8 +254,15 @@ the SQL string that would be sent to the database.
   types are `!buffer` (only available in Python 2), `!memoryview` (available
   from Python 2.7), `!bytearray` (available from Python 2.6) and `!bytes`
   (only form Python 3: the name is available from Python 2.6 but it's only an
-  alias for the type `!str`).  Received data is returned as `!buffer` (in
+  alias for the type `!str`). Any object implementing the `Revised Buffer
-  Python 2) or `!memoryview` (in Python 3).
+  Protocol`__ should be usable as binary type where the protocol is supported
+  (i.e. from Python 2.6). Received data is returned as `!buffer` (in Python 2)
+  or `!memoryview` (in Python 3).
+
+  .. __: http://www.python.org/dev/peps/pep-3118/
+
+  .. versionchanged:: 2.4
+     only strings were supported before.
 
   .. note::