Sustainable development is a hot topic in business and the media, and there is a growing demand for reliable environmental disclosure from a wide range of stakeholders. Ethical performance, including social and environmental performance, is actively scrutinized. A firm's stakeholders expect reliable disclosure to correctly assess its performance. Research on the link between environmental disclosure and environmental performance shows mixed results. Both a positive and a negative association have been found. This study reexamines this association by considering environmental innovation as a key determinant of environmental disclosure. We find that environmental performance and environmental innovation jointly determine environmental disclosure. At low levels of environmental performance, innovative firms tend to disclose more than their non‐innovative counterparts to inform stakeholders about their innovation and strategy to obtain an improved environmental performance. This disclosure gap tends to diminish as innovative firms become better environmental performers. The higher levels of environmental disclosure are closely associated with firms' environmental performance for both groups. Copyright © 2017 John Wiley & Sons, Ltd and ERP Environment