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An erratum or corrigendum (plurals: errata, corrigenda) (comes from errata corrige]]) is a correction of a published text. 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. An erratum is most commonly issued shortly after its original text is published.

Patches to security issues in a are also sometimes called errata. Erratum, like corrigendum, can also be used as a term for an error itself.


Errata sheets
According to the Chicago Manual of Style, "Errata, lists of errors and their corrections, may take the form of loose, inserted sheets or bound-in pages. An errata sheet is definitely not a usual part of a book. It should never be supplied to correct simple typographical errors (which may be rectified in a later printing) or to insert additions to, or revisions of, the printed text (which should wait for the next edition of the book). It is a device to be used only in extreme cases where errors severe enough to cause misunderstanding are detected too late to correct in the normal way but before the finished book is distributed. Then the errors may be listed with their locations and their corrections on a sheet that is , either before or after the book is bound, or laid in loose, usually inside the front cover of the book. (Tipping and inserting must be done by hand, thus adding considerably to the cost of the book.)" The Chicago Manual of Style. The University of Chicago Press, 14th Edition 1993, ISBN (cloth) 0-226-10389-7, p. 42, section 1.107.


CPU logic
Design errors and mistakes in a CPU's hardwired logic may also be documented and described as errata. One well-publicized example is 's "FDIV" erratum in early Pentium processors, known as the Pentium FDIV bug. This gave incorrect answers to a floating-point division instruction (FDIV) for a small set of numbers, due to an incorrect lookup table inside the Pentium chip.


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