To support language documentation, linguistic research, and acquisition of Sign Language of the Netherlands (NGT), we are expanding the NGT dataset in the lexical database Global Signbank. Our most prioritized goal is to add ca. 11,000 glosses (entries). We further aim at adding ca. 3,000 example sentences and to provide linguistic information with as many glosses as possible. As for linguistic information, Signbank allows for extensive phonological descriptions of signs, and the addition of multiple senses per sign, which we would like to connect to synsets in the Multilingual Sign Language Wordnet. Additionally, we are recording extra video data: we make multiple videos of the same sign, taken from different angles, and videos with non-manual expressions. Furthermore, we are collecting motion capture data, for improved (automatic) sign language recognition and production in the future. In this paper, we describe how we proceed, the decisions that have been made so far, and future uses of the dataset.