diff --git a/docs/fit.rst b/docs/fit.rst
new file mode 100644
index 00000000..dbc40234
--- /dev/null
+++ b/docs/fit.rst
@@ -0,0 +1,17 @@
+.. _fit:
+
+
+Use agnpy radiative processes to fit a MWL SED
+==============================================
+agnpy is a code for numerical modelling: routines for data handling and fitting are not only outside of its scope, but are currently already implemented in several python data-analysis packages.   
+Agnpy interfaceability with the astropy ecosystem allows it to be seamlessly interfaced with packages such as `sherpa` and `Gammapy`, containing these routines.
+In this documentation we provide several tutorial notebooks illustrating how to build wrappers with these two data-analysis packages to perform a :math:`\chi^2` fit of a MWL SED. 
+We consider different science tools and different science cases (radiative processes). The interested user can find:
+
+* `a tutorial notebook wrapping agnpy with sherpa and fitting Mrk421 MWL SED <tutorials/ssc_sherpa_fit.html>`_;
+
+* `a tutorial notebook wrapping agnpy with Gammapy and fitting Mrk421 MWL SED <tutorials/ssc_gammapy_fit.html>`_;
+
+* `a tutorial notebook wrapping agnpy with sherpa and fitting PKS 1510-089 MWL SED <tutorials/ec_dt_sherpa_fit.html>`_;
+
+* `a tutorial notebook wrapping agnpy with Gammapy and fitting PKS 1510-089 MWL SED <tutorials/ec_dt_gammapy_fit.html>`_.
\ No newline at end of file
diff --git a/docs/index.rst b/docs/index.rst
index 415b3396..1aaa2df7 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -18,7 +18,7 @@ The numerical operations are delegated to `numpy arrays <https://numpy.org>`_, a
 
 License
 -------
-The code is licensed under `GNU General Public License v3.0 <https://www.gnu.org/licenses/gpl-3.0.html>`_ (see `LICENSE.md` in the main directory).
+The code is licensed under `BSD-3-Clause License <https://opensource.org/licenses/BSD-3-Clause>`_ (see `LICENSE.md` in the main directory).
 
 Installation
 ------------
@@ -63,8 +63,11 @@ The documentation includes several tutorial jupyter notebooks providing examples
    tutorials/absorption_targets.ipynb
    derivations
    spectral_constraints
+   fit
    tutorials/ssc_sherpa_fit.ipynb
+   tutorials/ssc_gammapy_fit.ipynb
    tutorials/ec_dt_sherpa_fit.ipynb
+   tutorials/ec_dt_gammapy_fit.ipynb
    bibliography
    agnpy
 
diff --git a/environment.yml b/environment.yml
index 041b3c9f..8020c0b3 100644
--- a/environment.yml
+++ b/environment.yml
@@ -15,4 +15,5 @@ dependencies:
   - sherpa
   - pip:
     - agnpy
+    - gammapy