diff --git a/doc/source/users/user_manual/models_spatial.rst b/doc/source/users/user_manual/models_spatial.rst
index 8db16c7..5a65928 100644
--- a/doc/source/users/user_manual/models_spatial.rst
+++ b/doc/source/users/user_manual/models_spatial.rst
@@ -156,6 +156,42 @@ RadialGaussian
* ``DEC`` is the Declination of the Gaussian centre (degrees)
* :math:`\sigma` = ``Sigma`` (degrees)
+ RadialGeneralGaussian
+~~~~~~~~~~~~~~
+
+ The ``RadialGeneralGaussian`` model describes a generalised Gaussian
+ intensity distribution, with the radial profile index as a model parameter.
+
+ .. code-block:: xml
+
+
+
+
+
+
+
+
+
+ ...
+
+
+
+ and implements
+
+ .. math::
+ M_{\rm spatial}(\theta) = \frac{1}{2 \pi r^2 \eta \Gamma(2\eta)} \exp
+ \left[- \left(\frac{\theta^2}{r^2}\right)^\frac{1}{\eta} \right],
+
+ where
+
+ * ``RA`` is the Right Ascension of the Gaussian centre (degrees)
+ * ``DEC`` is the Declination of the Gaussian centre (degrees)
+ * :math:`r` = ``Radius`` (degrees)
+ * :math:`\eta` = ``R_Index``
+
+The model normalisation is correct in the small angle
+ approximation and for :math:`\eta` order unity or smaller.
+
RadialShell
~~~~~~~~~~~
@@ -275,6 +311,54 @@ EllipticalGaussian
from North
* :math:`\phi` is the azimuth angle with respect to North.
+ EllipticalGeneralGaussian
+~~~~~~~~~~~~~~~~~~
+
+ The ``EllipticalGeneralGaussian`` model describes a Gaussian intensity distribution
+
+ .. code-block:: xml
+
+
+
+
+
+
+
+
+
+
+
+ ...
+
+
+
+ and implements
+
+ .. math::
+ M_{\rm spatial}(\theta, \phi) = \frac{1}{2 \pi r^2 \eta
+ \Gamma(2\eta)} \exp \left[ -\left(\frac{\theta^2}{2 r_\mathrm{eff}^2}\right)^\frac{1}{\eta} \right],
+
+ with
+
+ .. math::
+ r_\mathrm{eff} = \frac{ab} {\sqrt{\left( a \sin (\phi - \phi_0) \right)^2 +
+ \sqrt{\left( b \cos (\phi - \phi_0) \right)^2}}}
+
+ where
+
+ * ``RA`` is the Right Ascension (degrees)
+ * ``DEC`` is the Declination (degrees)
+ * ``PA`` is the position angle, counted counterclockwise from North (degrees)
+ * :math:`a` = ``MinorRadius`` (degrees)
+ * :math:`b` = ``MajorRadius`` (degrees)
+ * :math:`\phi_0` is the position angle of the ellipse, counted counterclockwise
+ from North
+ * :math:`\phi` is the azimuth angle with respect to North
+ * :math:`\eta` = ``R_Index``
+
+ The model normalisation is correct in the small angle
+ approximation and for :math:`\eta` order unity or smaller.
+
Diffuse source
^^^^^^^^^^^^^^