Document the AsyncIOLoop.asyncio_loop attribute for public use.

diff --git a/docs/asyncio.rst b/docs/asyncio.rst
index 06dc44c32759ea904fe02d0005111ab49a256891..e7c2c8fd9f29d5ec0b4ffb2c18c03aa658ad48e1 100644 (file)
--- a/docs/asyncio.rst
+++ b/docs/asyncio.rst
@@ -42,3 +42,6 @@ loops.
         from tornado.ioloop import IOLoop
         IOLoop.configure('tornado.platform.asyncio.AsyncIOLoop')
         IOLoop.instance().start()
+
+    Each ``AsyncIOLoop`` creates a new ``asyncio.EventLoop``; this object
+    can be accessed with the ``asyncio_loop`` attribute.