Loic Hausammann
--- a/doc/RTD/source/SubgridModels/GEAR/index.rst
+++ b/doc/RTD/source/SubgridModels/GEAR/index.rst
 This additional pressure can be seen as the pressure due to unresolved hydrodynamics turbulence and is given by:

 .. math::
-    P_\textrm{Jeans} = \frac{\rho}{\gamma} \left( \frac{4}{\pi} G h^2 \rho N_\textrm{Jeans}^{2/3} - \sigma^2 \right)
+    P_\textrm{Jeans} = \frac{\rho}{\gamma} \frac{4}{\pi} G h^2 \rho N_\textrm{Jeans}^{2/3}

 where :math:`\rho` is the density, :math:`\gamma` the adiabatic index, :math:`G` is the gravitational constant,
-:math:`h` the smoothing length, :math:`N_\textrm{Jeans}` is the number of particle required in order to resolve a clump and
-:math:`\sigma` the velocity dispersion.
+:math:`h` the smoothing length and :math:`N_\textrm{Jeans}` (``GEARPressureFloor:jeans_factor`` in the parameter file) is the number of particle required in order to resolve a clump.