versions of Python)
* `concurrent.futures <https://pypi.python.org/pypi/futures>`_ is the
recommended thread pool for use with Tornado and enables the use of
- `~tornado.netutil.ThreadedResolver`. It is needed only on Python 2;
+ ``tornado.netutil.ThreadedResolver``. It is needed only on Python 2;
Python 3 includes this package in the standard library.
* `pycurl <http://pycurl.sourceforge.net>`_ is used by the optional
``tornado.curl_httpclient``. Libcurl version 7.18.2 or higher is required;