add a note about the requirements of the threads workers under python…

… 2.x fix #1200
benoitc · May 2, 2016 · ded610e · ded610e
1 parent 6f9ae5e
commit ded610e
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diff --git a/docs/source/design.rst b/docs/source/design.rst
@@ -123,6 +123,9 @@ as the application code will be shared among workers but loaded only in the
 worker processes (unlike when using the preload setting, which loads the code in
 the master process).
 
+.. note:: Under Python 2.x, uou need to install the 'futures' package to use
+this feature.
+
 .. _Greenlets: https://github.com/python-greenlet/greenlet
 .. _Eventlet: http://eventlet.net
 .. _Gevent: http://gevent.org