add a bit of clarity to install instructions

docs/source/install.rst

@@ -3,16 +3,22 @@
 Installing ``repo2docker``
 ==========================
 
-1. Install `Docker <https://www.docker.com>`_ as it is required to build Docker images.
+Prerequisite: docker
+--------------------
 
-2. We recommend installing ``repo2docker`` with the ``pip`` tool::
+Install `Docker <https://www.docker.com>`_ as it is required to build Docker images.
+
+Installing with ``pip``
+-----------------------
+
+We recommend installing ``repo2docker`` with the ``pip`` tool::
 
     python3 -m pip install jupyter-repo2docker
 
 For infomation on using ``repo2docker``, see :ref:`usage`.
 
-Installing repo2docker from source code
+Installing from source code
----------------------------------------
+---------------------------
 
 Alternatively, you can install repo2docker from source,
 i.e. if you are contributing back to this project::
@@ -23,3 +29,14 @@ i.e. if you are contributing back to this project::
 
 That's it! For information on using ``repo2docker``, see
 :ref:`usage`.
+
+Note about Windows support
+--------------------------
+
+Windows support by ``repo2docker`` is still in the experimental stage. 
+
+An article about `using Windows and the WSL`_ (Windows Subsytem for Linux or
+Bash on Windows) provides additional information about Windows and docker.
+
+
+.. _using Windows and the WSL: https://nickjanetakis.com/blog/setting-up-docker-for-windows-and-wsl-to-work-flawlessly