Abstract.With the increasing number and complexity of legal obligations, ensuring business process compliance presents a major challenge for today's organizations. In this regard, implementing a set of control means and regularly auditing their effectiveness are suitable measures to ensure a compliant design and enactment of a business process. However, common business process modeling languages (PML) do not provide appropriate concepts to comprehensively model such control means. Not surprisingly, common PMLs are not widely used in the audit domain. To address this gap, this paper presents an extension of a PML with modeling concepts for process-integrated control means. As it is based on previous empirical research with auditors, the extension especially considers their requirements. The results of a laboratory experiment with 78 participants demonstrate that the extension supports auditors to gain a more comprehensive understanding of internal controls in a process model compared to current audit practice.