Erratum

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An erratum or corrigendum (plurals: errata, corrigenda) is a correction of a book. 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.

[edit] Errata sheets

An errata sheet is a common method of post-production editing in which the errors left in the produced copy are outlined on a sheet of paper bound into the book. This is a common method by which large works are "edited"; i.e. if the volume would cost too much and/or be too cumbersome to correct internally, this is an acceptable method by which one might edit the work.

[edit] Meanings in a non-editorial context

Design errors and mistakes in a CPU's hardwired microcode may also be referred to as errata. One well publicised example is Intel's "flag" erratum in early Pentium processors,^[1] known as the Pentium FDIV bug. This made the conversion of floating point numbers to integers unreliable due to an exception not being signaled under certain conditions.