Update README.rst

README.rst

@@ -5,4 +5,8 @@ About tkwantoperator
 
 Install instructions
 ~~~~~~~~~~~~~~~~~~~~
-Complete install instructions can be found in :ref:`install` (or the file `INSTALL.rst <https://gitlab.kwant-project.org/kwant/tkwantoperator/-/blob/master/INSTALL.rst>`_ in the git repository).
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+Complete install instructions can be found in :ref:`install` (or the file `INSTALL.rst <https://gitlab.kwant-project.org/kwant/tkwantoperator/-/blob/master/INSTALL.rst>`_ in the git repository).
+
+Documentation
+~~~~~~~~~~~~~
+The documentation of this package, along with a tutorial, is available at : https://kwant-project.org/extensions/tkwantoperator
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