A(Li) as a function of the projected rotational velocity, v sin i, in our sample of giant stars with 3800 K  ≤ T_eff ≤  5000 K and log g ≤  3.5: grey circles are the giant stars in open clusters and in the field with A(Li)  <  2.0 dex, while light yellow and green stars represent A(Li)  ≥  2 dex in giants in open clusters and in the field, respectively. Red squares are the giant stars observed by Delgado Mena et al. (2016), and cyan squares are those observed by de Medeiros et al. (2000).