An erratum or corrigendum (plurals: errata, corrigenda) (comes from la, 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. It is usually bound into the back of a book, but for a single error a slip of paper detailing a corrigendum may be bound in before or after the page on which the error appears. An erratum may also be issued shortly after its original text is published.


Corrigendum is the gerundive form of the Latin compound verb ''corrigo -rexi -rectum'' (from the verb ''rego'', "to make straight, rule", plus the preposition ''cum'', "with"), "to correct", and thus signifiesassuming the full form has added to it the verb ''sum'' or parts thereof, changing the meaning to the idea of necessity or compulsion "(those things) which must be corrected" and in its single form ''Corrigendum'' it means "(that thing) which must be corrected".

Errata sheets

According to the ''
Chicago Manual of Style ''The Chicago Manual of Style'' (abbreviated in writing as ''CMOS'' or ''CMS'', or sometimes as ''Chicago'') is a style guide A style guide or manual of style is a set of standards for the writing, formatting, and design of documents ...
'', "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 error A typographical error (often shortened/nicknamed to typo), also called misprint, is a mistake (such as a spelling mistake) made in the typing Typing is the process of writing or inputting text by pressing keys on a typewriter, computer keyboard, ...
s (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 tipped in, 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.)"

CPU logic

Design errors and mistakes in a
microprocessor A microprocessor is a computer processor where the data processing logic and control is included on a single integrated circuit An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip ...

's hardwired logic may also be documented and described as errata. One well-publicized example is
Intel Intel Corporation is an American multinational corporation A multinational company (MNC) is a corporate A corporation is an organization—usually a group of people or a company A company, abbreviated as co., is a Legal personalit ...

's "FDIV" erratum in early
Pentium Pentium is a brand used for a series of x86 x86 is a family of instruction set architecture In computer science, an instruction set architecture (ISA), also called computer architecture, is an abstract model of a computer. A device ...
processors, known as the
Pentium FDIV bug 66 MHz Intel Pentium (sSpec=SX837) with the FDIV bug The Pentium FDIV bug is a hardware bug affecting the floating point unit (FPU) of the P5 (microarchitecture), early Intel Pentium processors. Because of the bug, the processor would return incor ...
. 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. Similarly, design errors in
peripheral A peripheral or peripheral device is an auxiliary device used to put information into and get information out of the computer. The term peripheral device refers to all hardware components that are attached to a computer and are controlled by the co ...
devices, such as disk controllers and video display units, can result in abnormal operation under certain conditions.

See also

Addendum An addendum or appendix, in general, is an addition required to be made to a document by its author subsequent to its printing or publication. It comes from the Latin Latin (, or , ) is a classical language belonging to the Italic languages, I ...
Bible errata Throughout history, printers' errors and peculiar translations have appeared in Bible The Bible (from Koine Greek Koine Greek (, , Greek approximately ;. , , , lit. "Common Greek"), also known as Alexandrian dialect, common Attic, ...
Cancel leafA cancel is a bibliographic term for a replaced leaf (books), leaf in a printed book.Bibliographical Notes and Queries - Volumes 1-2 - Page 11 1935 - Normally, a cancel leaf is of course later than what I may call an integral leaf. The technique ...
Correction (newspaper) A correction in a newspaper usually consists of posting a public notice about a typographical error or factual mistake in a previously published article. Newspapers usually have specific policies for readers to report factual errors. Generally, th ...
Retraction In academic publishing, a retraction is the action by which a published paper in an academic journal is removed from the journal. Online journals typically remove the retracted article from online access. Procedure A retraction may be initiate ...


External links

{{Book structure Error Book terminology Publishing terminology Latin words and phrases