In line with a number of southern Bantu languages (including all Nguni, Venda, Tsonga and Shona), and also all Khoisan languages of southwestern Africa), a significant subset of the consonants in Phuthi are 'depressors' (or 'breathy voiced'). These consonants are so named because they have a consistent depression effect on the pitch of an immediately successive H (high) tone. In addition, these consonants produce complex non-local phonological tone-depression effects. Swati and Phuthi have similar properties in this respect, except that the parameters of the Phuthi depression effects are significantly more complex than those documented thus far for Swati.