In article e25354, Lingpeng Meng and colleagues discuss the chalcogen - chalcogen bond (S···S and Se···Se) which can be formed between two SHCl (SeHCl) dimers. When a third molecule X (X = PH2Cl, SHCl, ClCl) is added to these dimers, cyclic trimers SHCl···SHCl···X and SeHCl···SeHCl···X are formed, and the chalcogen - chalcogen bond (S···S and Se···Se) appears to be strengthened. Computational studies allow to compare the effects of the different X molecules, and determine that X=PH2Cl yields the largest increase in chalcogen–chalcogen bond strength. (DOI: 10.1002/qua.25354)