Calculations with the self-consistent-charge (SCC) density-functional tight binding method with full third order terms 90 (DFTB3) are performed with the DFTB+ code with the SCC tolerance set to 10 -7 a.u. using the parameter set 3OB. Hydrogen interactions are corrected with a damping exponent of 4.2 in the SCC short-range contribution. DFTB3 is extended with the London dispersion correction D3 as parametrized for DFTB3 with the Becke-Johnson damping variant. The geometry optimizations are carried out with the L-BFGS algorithm and default convergence criteria.