added note on using the heroku training sandbox to the ttw theming do…

…cument
plone · Oct 10, 2016 · 314b367 · 314b367
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diff --git a/theming/ttw-advanced.rst b/theming/ttw-advanced.rst
@@ -18,6 +18,12 @@ Topics covered:
 * ``<body>`` element CSS classes
 * Conditionally activating rules
 
+Installation
+------------
+
+We will use a `Plone pre-configured Heroku instance <https://github.com/collective/training-sandbox>`_.
+
+Once deployed, create a Plone site.
 
 Two approaches to theming
 -------------------------