The performance of DFT-D in the prediction of the lattice energies of organic solids has been assessed in a number of benchmark studies. The work of Otero-de-la-Roza & Johnson and Reilly & Tkatchenko led to the construction of the X23 test set, a set of 23 organic crystal structures with reference lattice energies derived from a combination of reliable sublimation enthalpy results and accurate vibrational corrections from lattice dynamics. Reilly & Tkatchenko found that the use of the PBE0 hybridfunctional and the MBD dispersion correction yields a mean absolute deviation of 3.92 kJ/mol compared to the experimental data. Brandenburg & Grimme found that the PBE functional with the D3 dispersion correction achieved a mean absolute deviation of 4.48 kJ/mol. Comparing the performance of an array of functionals, Moellmann & Grimme and Brandenburg et al. showed that the TPSS functional and PBE functional both perform well when paired with the D3 dispersion correction, with mean absolute deviations of 3.77 and 4.60 kJ/mol, respectively. It is of note that these errors are within the uncertainty of sublimation enthalpy experiments making estimates of the true accuracy of these methods challenging. Further benchmarking of DFT-D in CSP applications was carried out using the POLY59 benchmark set and demonstrated that the TPSS and PBE functionals with the D3 correction are sufficiently accurate to identify the most stable polymorphs of all molecules used in the sixth blind test . The reported accuracy of these calculations adds credence to the use of theoretical results in lieu of reliable experimental data.