The September 2016 update on Crossref's Similarity Check highlights branding changes, current statistics, and indexing method upgrades. The service, powered by iThenticate technology, has over 1,100 users and 52 million indexed content items, with enhancements for faster and safer indexing via full-text URLs. Key reminders for users include depositing full-text URLs in DOIs by December 31, 2016, and whitelisting Turnitin's IP range.