This paper introduces ELEON, an editor that allows the enrichment of OWL ontologies with linguistic and user-related annotations. The enriched ontologies are used by natural language generation (NLG) engines to generate textual descriptions of the objects represented in the ontologies in the selected language and according to user’s model. ELEON provides a well-defined interface that can be used by different NLG engines. The paper presents the relevant functionalities of ELEON, describes the provided interface to NLG engines and discusses the advantages of exploiting such enriched ontologies in NLG.