support docstrings in enum::value() (#1160)

diff --git a/docs/changelog.rst b/docs/changelog.rst
index b0d958d..ec8dc72 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -18,6 +18,9 @@
 * Added support for write only properties.
   `#1144 <https://github.com/pybind/pybind11/pull/1144>`_.
 
+* The ``value()``  method of ``py::enum_`` now accepts an optional docstring
+  that will be shown in the documentation of the associated enumeration.
+
 v2.2.1 (September 14, 2017)
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