message: fix installation doc
diff: @@ -393,7 +393,11 @@ mathematics, science, and engineering.
  TensorFlow
  ----------
  -`TensorFlow <https://www.tensorflow.org>`_ is currently only used in some automatic differentiation tests.
  +The :doc:`cubical complex </cubical_complex_tflow_itf_ref>`, :doc:`simplex tree </ls_simplex_tree_tflow_itf_ref>`
  +and :doc:`Rips complex </rips_complex_tflow_itf_ref>` modules require `TensorFlow <https://www.tensorflow.org>`_
  +for incorporating them in neural nets.
  +
  +`TensorFlow <https://www.tensorflow.org>`_ is also used in some automatic differentiation tests.
  Bug reports and contributions
  *****************************
  