 This paper examined the practice of sample size justification in qualitative health research published in three different journals. The authors found that sample size justification was limited and that it was rarely related to the number of interviews. Instead, sample size was usually justified based on the principle of saturation or pragmatic considerations. Furthermore, the authors observed that qualitative sample sizes were often described as insufficient and discussed in relation to study limitations. They concluded that qualitative researchers should be more transparent when discussing sample size, and that data adequacy should be evaluated with reference to feature specific to each individual study. Additionally, reviewers should support this type of transparency by providing feedback on the adequacy of sample size. This article was authored by Konstantin Vassilay, Julie Barnett, Susan Thorpe, and others.