Update installation.rst (#3083)
diff --git a/docs/installation.rst b/docs/installation.rst
index a2455c2..2e1b3ae 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -192,7 +192,7 @@
$ pip install cryptography
-If you want to build cryptography yourself or are on an older OS X version
+If you want to build cryptography yourself or are on an older OS X version,
cryptography requires the presence of a C compiler, development headers, and
the proper libraries. On OS X much of this is provided by Apple's Xcode
development tools. To install the Xcode command line tools (on OS X 10.9+)