Nyole has an interesting development from Proto-Bantu *p → Nyole . Schadeberg (1989) connects this sound change to rhinoglottophilia, where the sound change developed first as → → . Then, given the acoustic similarity of and breathy voice to nasalization, the sound change progressed as → → . The velar place of articulation development is due to velar nasals being the least perceptible of the nasals and its marginal status in (pre-)Nyole and other Bantu languages. In closely related neighboring languages, *p developed variously into or or was deleted.