Household Registration Act Article 12

Developmentally disabled or mentally disabled people only partly able to show their intentions or people who have insufficient ability to recognize their intentions and been declared in need of assistance should conduct assistance registration.
中文原文 戶籍法第12條
因精神障礙或其他心智缺陷,致為意思表示或受意思表示,或辨識其意思表示效果之能力,顯有不足之情事,經法院為輔助之宣告者,應為輔助登記。

English translation for reference only; the Chinese text prevails. Not legal advice.