How to Say "addendum" in Spanish
The Spanish word for “addendum” is “apéndice” — B2 level.
English → SpanishB2
nounB2formal
additional information at the end of a text

Examples
Puedes ver la lista completa en el apéndice del libro.
You can see the full list in the book's appendix.
El autor añadió un apéndice con mapas históricos.
The author added an appendix with historical maps.
Consulta el apéndice B para más detalles.
Check appendix B for more details.
Plural Form
To make it plural, add '-ces' and remove the accent: 'apéndices'. This happens with many Spanish words ending in 'ce'.
Accent Mark
Mistake: “apendice”
Correction: apéndice (it needs the accent on the 'e' because it is a 'palabra esdrújula'—words stressed on the third-to-last syllable always have accents).
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