some commas that look correct
diff --git a/docs/hazmat/bindings/openssl.rst b/docs/hazmat/bindings/openssl.rst
index 446c450..0ec0a3d 100644
--- a/docs/hazmat/bindings/openssl.rst
+++ b/docs/hazmat/bindings/openssl.rst
@@ -37,7 +37,7 @@
``cryptography`` enables OpenSSLs `thread safety facilities`_ in two different
ways depending on the configuration of your system. Normally the locking
callbacks provided by your Python implementation specifically for OpenSSL will
-be used. However if you have linked ``cryptography`` to a different version of
+be used. However, if you have linked ``cryptography`` to a different version of
OpenSSL than that used by your Python implementation we enable an alternative
locking callback. This version is implemented in Python and so may result in
lower performance in some situations. In particular parallelism is reduced