diff --git a/tornado/ioloop.py b/tornado/ioloop.py
index 236feaa4..3e32be34 100644
--- a/tornado/ioloop.py
+++ b/tornado/ioloop.py
@@ -522,6 +522,8 @@ class IOLoop(object):
         _FUTURE_TYPES = DummyFuture
     def add_future(self, future, callback):
         """Schedules a callback on the IOLoop when the given future is finished.
+
+        The callback is invoked with one argument, the future.
         """
         assert isinstance(future, IOLoop._FUTURE_TYPES)
         callback = stack_context.wrap(callback)
diff --git a/website/sphinx/ioloop.rst b/website/sphinx/ioloop.rst
index 3e6e8ed3..a6f4819c 100644
--- a/website/sphinx/ioloop.rst
+++ b/website/sphinx/ioloop.rst
@@ -30,6 +30,8 @@
    ^^^^^^^^
 
    .. automethod:: IOLoop.add_callback
+   .. automethod:: IOLoop.add_callback_from_signal
+   .. automethod:: IOLoop.add_future
    .. automethod:: IOLoop.add_timeout
    .. automethod:: IOLoop.remove_timeout
    .. autoclass:: PeriodicCallback
diff --git a/website/sphinx/websocket.rst b/website/sphinx/websocket.rst
index be7bbc54..0b689440 100644
--- a/website/sphinx/websocket.rst
+++ b/website/sphinx/websocket.rst
@@ -29,3 +29,5 @@
    -----
 
    .. automethod:: WebSocketHandler.async_callback
+   .. automethod:: WebSocketHandler.ping
+   .. automethod:: WebSocketHandler.on_pong