This is a maintenance category, used for maintenance of the Wikipedia project. It is not part of the encyclopedia and contains non-article pages, or groups articles by status rather than subject. Do not include this category in content categories.

The following categories are automatically generated by ((infobox language)), ((infobox proto-language)) and ((infobox language family)). They are used to track poorly formatted infoboxes, out-of-date information, unreferenced statistics, and similar problems.

Categories are grouped below under (D) date problems, (E) Ethnologue tracking, (G) Glottolog tracking, (I) ISO tracking, (P) parameter problems, and missing (R) references, (S) speaker data, and (T) language codes. The categories under P, R, S, T should be empty. Articles occasionally appear due to editing errors or vandalism. Old speaker data under (D) fills up each year as the data becomes dated. The other categories are populated with some intentional articles that may be useful to keep track of, but unintentional articles may show up due to editing errors or vandalism.

Subcategories with large numbers of articles that require update or verification, as of 2015 April: 
  Language articles with unknown extinction date (346 P)
  Language articles with unreferenced extinction date (839 P)