[docs] added line to install pyyaml to base conda env, #123

doc/install.rst

@@ -40,8 +40,7 @@ To use this OVF file in the Virtualbox GUI, select "Import Appliance" under the
 
 The username and password for the image are both ``beat``.
 
-The BEAT commands ``beat`` and ``beateditor``, should be available in the shell.
-
+The BEAT commands, ``beat`` and ``beateditor``, should be available in the shell in the VM. The Firefox browser is available, as is the Vim, Emacs, Nano, and Gedit editors.
 
 Method 2: Conda (easyish)
 =========================
@@ -100,6 +99,7 @@ Installation Steps
 #. Use ``bob.admin`` to create a development Conda environment named ``beatedit`` for Python 3.6: ::
 
    $ conda activate base
+   $ conda install pyyaml # install a dependency that isn't fetched by default
    $ cd beat.editor
    $ ../bob.admin/conda/conda-bootstrap.py --overwrite --python=3.6 beatedit