diff --git a/docs/starting/install/osx.rst b/docs/starting/install/osx.rst
index f0851d3..24eb274 100644
--- a/docs/starting/install/osx.rst
+++ b/docs/starting/install/osx.rst
@@ -14,7 +14,7 @@ described in the next section before you start building Python applications for
 real-world use. In particular, you should always install Setuptools, as it makes
 it much easier for you to install and manage other third-party Python libraries.
 
-The version of Python that ships with OS X is great for learning but it's not
+The version of Python that ships with OS X is great for learning, but it's not
 good for development. The version shipped with OS X may be out of date from the
 `official current Python release <https://www.python.org/downloads/mac-osx/>`_,
 which is considered the stable production version.
diff --git a/docs/starting/install3/osx.rst b/docs/starting/install3/osx.rst
index 8a82822..8844f2e 100644
--- a/docs/starting/install3/osx.rst
+++ b/docs/starting/install3/osx.rst
@@ -10,7 +10,7 @@ The latest version of Mac OS X, Sierra, **comes with Python 2.7 out of the box**
 You do not need to install or configure anything else to use Python 2. These
 instructions document the installation of Python 3.
 
-The version of Python that ships with OS X is great for learning but it's not
+The version of Python that ships with OS X is great for learning, but it's not
 good for development. The version shipped with OS X may be out of date from the
 `official current Python release <https://www.python.org/downloads/mac-osx/>`_,
 which is considered the stable production version.