In this paper we present a project aimed at building a collaborative bibliography on AI and DH topics, promoted by AIUCD’s Special Interest Group DH-AI. The project focuses especially on the subject indexing of bibliography contents, that is, the collaborative tagging of resources. After an overview of the state of the art, we present the DH-AI community’s initial activities and discuss the rationale behind our choices: the use of Zotero as the platform for collecting bibliographic items, and the development of an indexing model based on a controlled vocabulary defined by the community and integrable with existing resources such as the Nuovo Soggettario (NS), the Italian national subject heading system.