The Additional Act was an amendment to the Brazilian Constitution of 1824, passed on August 12, 1834. The amendment enhanced the autonomy of the provinces.

You can help expand this article with text translated from the corresponding article in Portuguese. (December 2009) Click [show] for important translation instructions. View a machine-translated version of the Portuguese article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Portuguese Wikipedia article at [[:pt:Ato Adicional]]; see its history for attribution. You should also add the template {{Translated|pt|Ato Adicional}} to the talk page. For more guidance, see Wikipedia:Translation.

• "Acto Adicional of 1834". Encyclopædia Britannica Online. Encyclopædia Britannica. 2009. Retrieved 2009-04-29.

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