We explore the effect of offering an open-ended comment field in a Web survey to reduce the threat of sensitive questions. Two experiments were field in a probability-based Web panel in the Netherlands. For a set of 10 items on attitudes to immigrants, a random half were offered the opportunity to explain or clarify their responses, with the hypothesis being that doing so would reduce the need to choose socially desirable answers, resulting in higher levels of prejudice. Across two experiments, we find significant effects contrary to our hypothesis – the opportunity to comment decreased the level of prejudice reported, …