This work presents an experience report on the evolutionary development of a software product line (SPL) in the eHealth domain. The eﬀort was triggered by the concurrent devel- opment of two similar products and the ambition to reduce redundant development and quality assurance. The result is a scalable base for a complex, highly adaptable information system. This system is required to be applicable in multiple business domains and diverging environments ranging from large scale hospitals to single practitioner clinics. During this eﬀort we were able to extract the common denominator in the form of core assets from existing appli- cations speciﬁc to a medical ﬁeld. For customisations well deﬁned variation points were developed. Our solution allows for easy implementation of medical documentation require- ments compared to tedious development of new applications from scratch. It signiﬁcantly reduced the necessary devel- opment eﬀort and time to market. The resulting core doc- umentation platform can be used for an arbitrary medical ﬁeld completely eliminating the dependence on the speciﬁc customer domain.