Our implementation of a 2-body additive QM/MM model provides a very simple and therefore convenient way to incorporate the influence of a molecular crystal environment on a single molecule. It only requires a periodic structure as starting point as well as a set of predefined LJ parameters. Electrostatics are computed selfconsistently from QM calculations (using an arbitrary scheme) and expanded to simulate periodic boundary conditions. While much more elaborate and thus precise models for the theoretical description of molecular crystals are available, one of the major advantages of AC-QM/MM is its inherent flexibility. This is even valid when comparing to subtractive QM/MM approaches. The latter depend much more on the definition of the low level of theory, which must be complete for any system one wishes to compute. In our case, LJ-parameters are sufficient to obtain a working expression.