Besides calculations of excitation energies (and oscillator strengths), also a generalization for the calculation of two-photon absorption cross sections from embedded ADC(2) calculations has been presented . Further efficiency enhancements have been achieved by Treß et al., who combined the uncoupled FDE approach with pair natural orbital (PNO) implementations of the second-order methods CIS(D), ADC(2), and CC2 . An efficient and versatile implementation of embedded wavefunction methods like CIS(D), ADC(2), and CC(2), as well as GW/BSE embedded in DFT together with some proof-of-principle calculations of excitation energies and oscillator strengths was presented in the framework of the Serenity code in Ref. 12. We also note that a subsystem-based derivation of GW/BSE and a corresponding implementation (featuring uncoupled excitations) has been developed in Refs. .