Clarify and correct description for ccbench and iobench.
diff --git a/Doc/whatsnew/2.7.rst b/Doc/whatsnew/2.7.rst
index edc1f0d..f5c6e20 100644
--- a/Doc/whatsnew/2.7.rst
+++ b/Doc/whatsnew/2.7.rst
@@ -1305,9 +1305,10 @@
* Two benchmark scripts, :file:`iobench` and :file:`ccbench`, were
added to the :file:`Tools` directory. :file:`iobench` measures the
- speed of the built-in :class:`file` objects while performing various
- operations, and :file:`ccbench` is a concurrency that performs
- several tasks using a varying number of threads.
+ speed of built-in file I/O objects (as returned by :func:`open`)
+ while performing various operations, and :file:`ccbench` is a concurrency
+ benchmark that tries to measure computing throughput and thread switching
+ latency when performing several tasks using a varying number of threads.
* When importing a module from a :file:`.pyc` or :file:`.pyo` file
with an existing :file:`.py` counterpart, the :attr:`co_filename`