Reproducible research requires reproducible computational environments. The results of modern life science research depend on many different factors like configuration settings, software packages and hardware configurations. These factors make up the environment in which a computation is performed. Any change in the environment can potentially lead to unintended changes in the computed results. Therefore research is only reproducible if the environment used to compute its results is too. Our compenv software project aims to improve the reproducibility of computational environments by recording information about the environment used to compute a particular result.