The Internet of Services is commonly referred to as the underlying platform for realizing ad-hoc value networks in the web. In the case of decentralized service discovery, brokerage, or community feedback, there emerge a number of service information challenges that have to be addressed. In this paper, we propose to counter such service information challenges by two artifacts. First, we contribute a Service Ontology as a consistent and holistic way of capturing service information. The ontology is constructed in an interdisciplinary and collaborative way and formalized with W3C Semantic Web recommendations. Second, we provide for the methodological aspects around the ontology including a governance framework and guidelines for interlinking information.