Yesterday, a new publication by Vasco und Florian entitled “Validation and Development of COI Metabarcoding Primers for Freshwater Macroinvertebrate Bioassessment“has been published in Frontiers in Environmental Science (Link). In the study we demonstrate problems with several of the currently available metabarcoding primers and tested four newly developed COI primers targeting aquatic macroinvertebrates. Our analyses show that the new primers (BF/BR) are highly suitable and amplify very equally the analysed taxa. Most importantly, however, our study shows how important careful design and validation of primers for a certain region, habitat or target taxon group is. With growing data bases there is still much potential for future improvement.