commoncrypto backend docs
diff --git a/docs/hazmat/backends/common-crypto.rst b/docs/hazmat/backends/common-crypto.rst
new file mode 100644
index 0000000..edd45b6
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+++ b/docs/hazmat/backends/common-crypto.rst
@@ -0,0 +1,28 @@
+.. hazmat::
+
+CommonCrypto Backend
+====================
+
+These are `CFFI`_ bindings to the `CommonCrypto`_ C library provided by Apple
+on OS X and iOS.
+
+.. currentmodule:: cryptography.hazmat.backends.commoncrypto.backend
+
+.. data:: cryptography.hazmat.backends.commoncrypto.backend
+
+ This is the exposed API for the CommonCrypto bindings. It has two public
+ attributes:
+
+ .. attribute:: ffi
+
+ This is a :class:`cffi.FFI` instance. It can be used to allocate and
+ otherwise manipulate CommonCrypto structures.
+
+ .. attribute:: lib
+
+ This is a ``cffi`` library. It can be used to call CommonCrypto
+ functions, and access constants.
+
+
+.. _`CFFI`: https://cffi.readthedocs.org/
+.. _`CommonCrypto`: https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man3/Common%20Crypto.3cc.html
diff --git a/docs/hazmat/backends/index.rst b/docs/hazmat/backends/index.rst
index 0695128..22354f6 100644
--- a/docs/hazmat/backends/index.rst
+++ b/docs/hazmat/backends/index.rst
@@ -31,4 +31,5 @@
:maxdepth: 1
openssl
+ common-crypto
interfaces