update import guide as advised
@@ -75,6 +75,10 @@ such as specifying a certain version of Python or installing additional dependen
You can configure these settings in a ``readthedocs.yml`` file.
See our :doc:`/config-file/index` docs for more details.
+It is also important to note that the default version of Sphinx is ``v1.8.5``. If
+chosing to build your documentation other than this, it must be specified in a
+``requirements.txt``` file.
+
Read the Docs will host multiple versions of your code. You can read more about
how to use this well on our :doc:`/versions` page.
