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Editors sometimes wonder what they should do on finding a correct but uncited statement in an article.
If there is unsourced info in an article, but you believe it to be true, you have several options:
Note that not all statements need be cited to a source (see Wikipedia:You don't need to cite that the sky is blue). If a statement is not a quotation, is not an extraordinary claim, is not controversial or challenged or likely to be challenged, and is not a negative statement about a living person, a source is not required (see Wikipedia:When to cite). Adding a source in such cases may be helpful, but is not essential. In some cases it can even be over-citation.
Things that are general or subject-specific common knowledge often do not need citations. The plot of a work of fiction (particularly in an article about that work) is implicitly cited to the work itself, and does not normally need any other citation. A fact cited in one place in an article but mentioned in other places in the same article need not be re-cited at each mention. This is particularly true of statements in the lead section that properly summarize cited content from the body of the article.