Update outdated comment.

diff --git a/tornado/concurrent.py b/tornado/concurrent.py
index 2d6d803d352869588c3a461b38b68c72b461528c..f491bd09d6e95e3fdfb623aa4b2560661c5f163e 100644 (file)
--- a/tornado/concurrent.py
+++ b/tornado/concurrent.py
@@ -16,11 +16,10 @@
 """Utilities for working with threads and ``Futures``.
 
 ``Futures`` are a pattern for concurrent programming introduced in
-Python 3.2 in the `concurrent.futures` package (this package has also
-been backported to older versions of Python and can be installed with
-``pip install futures``).  Tornado will use `concurrent.futures.Future` if
-it is available; otherwise it will use a compatible class defined in this
-module.
+Python 3.2 in the `concurrent.futures` package. This package defines
+a mostly-compatible `Future` class designed for use from coroutines,
+as well as some utility functions for interacting with the
+`concurrent.futures` package.
 """
 from __future__ import absolute_import, division, print_function, with_statement