First Steps Towards Revising Ontologies When modeling an ontology, one very often wants to add new information and keep the resulting ontology consistent. Belief Revision deals with the problem of consistently adding new formulas to a knowledge base. In this paper, we present some steps towards applying belief revision methods to ontologies based on description logics. We depart from the well known AGM-paradigm and show how it can be adapted in order to be applied to description logics.