Give reason to why UnshiftedReactionFieldFOrce was implemented in docs
@@ -5,7 +5,7 @@ Forces
The module :mod:`openmmtools.forces` implements custom forces that are not natively found in OpenMM.
- - :class:`UnshiftedReactionFieldForce`: A `CustomNonbondedForce <http://docs.openmm.org/7.1.0/api-python/generated/simtk.openmm.openmm.CustomNonbondedForce.html>`_ implementing a reaction field variant with `c_rf` term set to zero and a switching function.
+ - :class:`UnshiftedReactionFieldForce`: A `CustomNonbondedForce <http://docs.openmm.org/7.1.0/api-python/generated/simtk.openmm.openmm.CustomNonbondedForce.html>`_ implementing a reaction field variant with `c_rf` term set to zero and a switching function. Using the native OpenMM reaction field implementation with `c_rf != 0` can cause issues with hydration free energy calculations.
- :func:`find_nonbonded_force`: Find the first ``NonbondedForce`` in an OpenMM ``System``.
- :func:`iterate_nonbonded_forces`: Iterate over all the ``NonbondedForce``s in an OpenMM ``System``.
