This is a preprint of a proceedings article published as:
Marloes Oomen, Lyke Esselink, Tobias de Ronde, and Floris Roelofsen. 2023. First steps towards a procedure for annotating non-manual markers in sign languages. In NELS 53: Proceedings of the Fifty-Third Annual Meeting of the North East Linguistic Society, volume 2, pages 257–266. GLSA.