In a recent review study, Wedyan and Abufakher investigate design patterns and software quality and conclude: ""Our study has shown that the primary studies provide an empirical evidence on the positive effect of documentation of designs pattern instances on program comprehension, and therefore, maintainability. While this result is not surprising, it has, however, two indications. First, developers should pay more effort to add such documentation, even if in the form of simple comments in the source code. Second, when comparing results of different studies, the effect of documentation has to be considered.""