Excerpt from change request document:

Language surveys completed in 2007 identified Muko-Muko as a dialect of Minangkabau, with a shared ethnolinguistic identity, shared culture, and shared comprehension. The neighboring variety, Pekal [pel], was reportedly incomprehensible.

Muko-Muko shares the same phonological innovations as the Minangkabau dialects to the immediate north of it. The survey respondents stated they identified themselves as being part of the Minangkabau linguistic grouping and can understand more central dialects of Minangkabau. Muko-Muko was listed as a dialect of Minangkabau in Wurm and Hattori (1981) but the Ethnologue has it as a distinct language. The Wurm and Hattori map for southern Sumatra has Muko-Muko delineated with a dashed line inside the Minangkabau solid line, showing a dialect. The WIST survey of 2007 confirmed the ethnolinguistic identity of the Muko-Muko as being part of the Minangkabau grouping. The Pekal, also shown in the Wurm and Hattori atlas as a dialect of Minangkabau, did not have this same self identity, but identified themselves more with the Malayic varieties to the south of Bengkulu. Southern Sumatra survey report forthcoming.