MCXC-II catalogue update summary diagram. Top panel: revision of catalogue content, from left to right: 1) removal of one false cluster and seven duplicates (Sect. 2.3) in the original MCXC-I catalogue (Piffaretti et al. 2011); 2) entries from new ROSAT-based catalogues (Sect. 2.4); 3) new entries from source catalogues not previously considered owing to a lack of redshift or luminosity information (Sect. 2.2). Bottom panel: redshift revision of MCXC-II redshift (Sect. 3) and new redshift sources (Sect. 2.2).