add faq entry to describe the error if a windows user doesn't install openssl
diff --git a/docs/faq.rst b/docs/faq.rst
index 0b7bdce..54927e6 100644
--- a/docs/faq.rst
+++ b/docs/faq.rst
@@ -14,5 +14,18 @@
If you prefer NaCl's design, we highly recommend `PyNaCl`_.
+When I try to use ``cryptography`` on Windows I get a ``cffi.ffiplatform.VerificationError``
+--------------------------------------------------------------------------------------------
+
+This error looks something like:
+
+.. code-block:: console
+
+ cffi.ffiplatform.VerificationError: importing '<some_path>.pyd': DLL load failed:
+
+It typically occurs on Windows when the user has not installed OpenSSL. Download
+a `pre-compiled binary`_ to resolve this issue.
+
.. _`NaCl`: http://nacl.cr.yp.to/
.. _`PyNaCl`: https://pynacl.readthedocs.org
+.. _`pre-compiled binary`: https://www.openssl.org/related/binaries.html