On February 24th, 2021 the second Coffee Lecture of our series took place with the title "Datendokumentation: Die Basis hoher Datenqualität!". We would like to thank the numerous participants again! The event addressed the question of why good data documentation is so important and which different forms of data documentation are possible and how they can improve data quality. The 23-minute long presentation is now online on Youtube. The slides of the presentation are available in German on Zenodo.