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Erratum or corrigendum (plurals: errata, corrigenda) is a correction of a manual, handbook or other nonfictional text that contained mistakes. Errata are most commonly issued shortly after the original text was published. Patches to security issues in a computer program are also sometimes called errata. As a general rule, publishers issue an erratum for a production error (i.e. an error introduced during the publishing process) and a corrigendum for an author's error.