Add `ptds` docstring to `Stream`
@@ -304,6 +304,10 @@ class Stream(BaseStream):
stream that synchronizes with all streams). Otherwise, a plain new
stream is created. Note that you can also use ``Stream.null``
singleton object instead of creating new null stream object.
+ ptds (bool): If ``True`` and ``null`` is ``False``, the per-thread
+ default stream is used. Note that you can also use ``Stream.ptds``
+ singleton object instead of creating new per-thread default stream
+ object.
non_blocking (bool): If ``True``, the stream does not synchronize with
the NULL stream.
