An addenda (from Latin: addenda) is any addition that is added to a writing.[1]​.

If you want to use the Latin form you will say addendum, for the singular; and addenda, for the plural.

Contenido

El término puede usarse en diferentes contextos, siempre en el caso de producciones escritas, por ejemplo en escritura contractual, manuales técnicos, textos legales, médicos, entre otros. En todos los casos, el objeto de la misma es ampliar la información anteriormente escrita. Por ejemplo, los apuntes que Javier ha añadido como addenda, no entran en examen, son añadidos ajenos al temario.

in books

In a book, the addendum is a supplementary addition (sometimes it can refer to the appendix or plural appendices) that is added to the main work. It can explain inconsistencies or another way of explaining the information presented in the main work, especially if these types of problems were found too late to correct the work. For example, the main work might have already been printed and the cost of destroying and reprinting the batch would be considered too high. As such, the addendum can appear in many forms: an additional letter included with the work, digital text files, or any other similar medium. This serves to inform or alert the reader of any errors present, such as a typo.

Contract writing

This expression is used in contractual matters, through which the parties can modify, expand, or define the terms of the obligations contracted, without the need to sign a new instrument.[2]​.

In other documents, the most important of which are legal contracts, it is an addendum to an additional document not included in the main part of the contract that may contain additional terms, specifications, standards, standard forms or other information. An addendum to the contract may also be called an appendix, an annex or a pilot.

The addendum is often used in adhesion contracts to make changes or add specific details such as an addendum to change the date or add details regarding the delivery of goods, pricing, etc. The addendum refers to the contract; if no reference is made to the contract in the addendum, this will be made in the contract making reference to the addendum, to indicate that it is being modified by the addendum.