Data maturity is an important topic in data management, which is reflected by a growing number of tools and theories trying to measure it. Data maturity describes the degree of the formalization/standardization of a data object with respect to FAIRness and quality of the (meta-)data. Currently, the DataCite Metadata Schema does not provide an explicit property to link/store information on data maturity (e.g. FAIRness or quality of data/metadata). The AtMoDat project team drafted an extension to the DataCite Metadata Schema to host such information. This extension is denoted as "Data Maturity Indicator". Daniel Heydebreck (DKRZ) introduces the Data Maturity Indicator and explains the concept behind it.