Excerpt from change request document:
These five Southern Zhuang languages are not mutually intelligible with each other and have no common literature. They have been grouped into the same official nationality (Zhuang) since 1958 by the government (along with speakers of ccx, Northern Zhuang,
and Buyang), but previously did not share a common ethnolinguistic identity. There is no central variety or reference dialect for all five either (most commonly some dialect of Chinese is used as lingua franca among speakers of different Southern Zhuang langauges).