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-rw-r--r--doc/cmd.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/cmd.rst b/doc/cmd.rst
index 5f3cc539..f0896de8 100644
--- a/doc/cmd.rst
+++ b/doc/cmd.rst
@@ -104,7 +104,9 @@ Coverage.py can measure multi-threaded programs by default. If you are using
more exotic concurrency, with the `multiprocessing`_, `greenlet`_, `eventlet`_,
or `gevent`_ libraries, then coverage.py will get very confused. Use the
``--concurrency`` switch to properly measure programs using these libraries.
-Give it a value of ``greenlet``, ``eventlet``, or ``gevent``.
+Give it a value of ``multiprocessing``, ``thread``, ``greenlet``, ``eventlet``,
+or ``gevent``. Values other than ``thread`` require the :ref:`C extension
+<install_extension>`.
.. _multiprocessing: https://docs.python.org/2/library/multiprocessing.html
.. _greenlet: http://greenlet.readthedocs.org/en/latest/