CrossRef is an association of scholarly publishers that develops shared infrastructure to support more effective scholarly communications. In the 14 years since CrossRef launched, it has developed a number of services that hinge around the Digital Object Identifier (DOI) and the publication metadata submitted to CrossRef by publishers registering DOIs. CrossMark and FundRef are two additional services from CrossRef that publishers can choose to participate in, and both require publishers to provide additional information with the bibliographic metadata provided within their CrossRef deposits. This article will aim to show what this additional metadata is, how it should be formatted and why, so that publishers can use it to enhance their content and participate in additional CrossRef services that benefit the scholarly communications industry.

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