diff --git a/docs/getting_started/index.rst b/docs/getting_started/index.rst
index 706d911f1..e14359390 100644
--- a/docs/getting_started/index.rst
+++ b/docs/getting_started/index.rst
@@ -11,7 +11,8 @@ We'd also recommend Virtualenv, which provides isolated Python environments:
  * `Virtualenv <https://virtualenv.pypa.io/en/latest/installation.html>`_
 
 
-Before we install Wagtail we should install Pillow for image manipulation. Before you run ``pip install Pillow`` note that most platforms require you install additional libraries first: `Platform-specific installation instructions <http://pillow.readthedocs.org/en/latest/installation.html#os-x-installation>`_
+.. important::
+   Before installing Wagtail, it is necessary to install the **libjpeg** and **zlib** libraries, which provide support for working with JPEG, PNG and GIF images (via the Python **Pillow** library). The way to do this varies by platform - see Pillow's `platform-specific installation instructions <http://pillow.readthedocs.org/en/latest/installation.html#external-libraries>`_.
 
 With the above installed, the quickest way to install Wagtail is::