This comment focuses on an early case of an open infrastructure that emerged in the 1990s in international astronomy. It targets the reasons for this infrastructure's tremendous success and starts with a few comments on the term ‘digital infrastructure’. Subsequently, it provides a brief description of the most important components of the infrastructure in astronomy. In a third step, the use of one component — the arXiv, an open access repository for manuscripts — is analyzed. It concludes with some considerations about the success and acceptance of this infrastructure in astronomy.