--- /dev/null
+What's new in Tornado 4.0.1
+===========================
+
+In progress
+-----------
+
+* The build will now fall back to pure-python mode if the C extension
+ fails to build for any reason (previously it would fall back for some
+ errors but not others).
+* `.IOLoop.call_at` and `.IOLoop.call_later` now always return
+ a timeout handle for use with `.IOLoop.remove_timeout`.
+* If any callback of a `.PeriodicCallback` or `.IOStream` returns a
+ `.Future`, any error raised in that future will now be logged
+ (similar to the behavior of `.IOLoop.add_callback`).
+* Fixed an exception in client-side websocket connections when the
+ connection is closed.
+* ``simple_httpclient`` once again correctly handles 204 status
+ codes with no content-length header.
+* Fixed a regression in ``simple_httpclient`` that would result in
+ timeouts for certain kinds of errors.
# is zero for an official release, positive for a development branch,
# or negative for a release candidate or beta (after the base version
# number has been incremented)
-version = "4.0"
-version_info = (4, 0, 0, 0)
+version = "4.0.1b1"
+version_info = (4, 0, 1, -100)