Update for option introduced in mr 1366.

docs/source_docs/user_guide/inputs/fluid_model.rst

@@ -121,6 +121,12 @@ a single fluid; therefore, it is common to name the fluid ``fluid``. This is ill
 |                                            |                                                            |        |          |
 |                                            | A value is required when using the model ``ChengLaw``.     |        |          |
 +--------------------------------------------+------------------------------------------------------------+--------+----------+
+| viscosity.max_effective_factor             | Max limit of the effective viscosity as a factor of the    | Real   | 1.e6     |
+|                                            | molecular viscosity                                        |        |          |
+|                                            |                                                            |        |          |
+|                                            | :math:`\mu_{eff} < fac*\mu_{mol}`, where                   |        |          |
+|                                            | :math:`\mu_{eff} = \mu_{mol} + \mu_{eddy} + \mu_{susp}`    |        |          |
++--------------------------------------------+------------------------------------------------------------+--------+----------+
 | species                                    | Specify the species that constitute the fluid.             | String |  None    |
 |                                            |                                                            |        |          |
 |                                            | All listed species must be properly defined. See the       |        |          |