message: Mention POT in installation instructions
diff: @@ -215,6 +215,13 @@ The following examples require the `Matplotlib <http://matplotlib.org>`_:
  * :download:`euclidean_strong_witness_complex_diagram_persistence_from_off_file_example.py <../example/euclidean_strong_witness_complex_diagram_persistence_from_off_file_example.py>`
  * :download:`euclidean_witness_complex_diagram_persistence_from_off_file_example.py <../example/euclidean_witness_complex_diagram_persistence_from_off_file_example.py>`
  +Python Optimal Transport
  +========================
  +
  +The :doc:`Wasserstein distance </wasserstein_distance_user>`
  +module requires `POT <https://pot.readthedocs.io/>`_, a library that provides
  +several solvers for optimization problems related to Optimal Transport.
  +
  SciPy
  =====
  