Explainability has become a hot topic and communities from different areas of knowledge (e.g., machine learning, hci, philosophy, psychology, cyber-physical and recommender systems) have been researching it actively. Yet, the requirements engineering (RE) research community seems to be less concerned with the issue. At the same time, our community is extremely rich in methods and techniques that facilitate software development. This would add a lot of value to the explainability research and also ensure that we develop such techniques in parallel to the needs of other communities. Based on this motivation, we want to offer a workshop with three objectives: advancing RE for explainable systems, community building, and interdisciplinary exchange.