Comparison between the [Na/Fe]–A(Li) distribution of the stars in Omega Centauri (gray points and arrows) and the abundances measured in dwarf stars of some mono-metallic GCs from the literature, namely NGC 6397 (blue circles; Lind et al. 2009), NGC 6752 (green circles; Pasquini et al. 2005), M4 (red triangles; Monaco et al. 2012) and 47 Tucanae (cyan squares; Dobrovolskas et al. 2014). Light gray points and arrows indicate the entire sample of stars in Omega Centauri studied; dark gray points and arrows represent the target stars selected with a metallicity similar to that of the reference Galactic GC shown in each panel.