Complex decision-making is a prominent aspect of requirements engineering (RE) and the need for improved decision support for RE decision-makers has been identified by a number of authors in the research literature. Decision-supporting features and qualities can be integrated in RE tools. Thus, there is a need to evaluate the decision-supporting capabilities of RE tools. In this paper, we introduce a summative, criteria-based evaluation method termed DESCRY, which purpose is to investigate to what extent RE tools have decision-supporting capabilities. The criteria and their related questions are empirically as well as theoretically grounded.