Developing ontologies is not an easy task and often the resulting ontologies are not consistent or strucurally complete. Such ontologies, although often useful, also lead to problems when used in semantically-enabled applications. Wrong conclusions may be derived or valid conclusions may be missed. To deal with this problem we may want to repair the ontologies. In this demo we present a system that supports the repair of the is-a hierarchy in ontologies. We have developed a tool that, given missing is-a relations, generates and recommends relevant ways to repair the is-a structure of the ontology and that allows a domain expert to do the repair in a semi-automatic way.