Proofreaders' marks are symbols used by editors and proofreaders to indicate corrections or comments on a document. The most common marks are DELES (delete), STETS (let it stand) and CARETS (insert). DELES is used to indicate that a word, phrase or sentence should be removed from the document. STETS is used to indicate that a word, phrase or sentence should remain unchanged. CARETS is used to indicate that something should be inserted into the document.