This week, 10-15 September 2018, is international Peer Review Week. Now in its fourth year, the annual one-week event raises awareness of the importance of peer review, quality peer review practices, and related trends and issues. This year, the theme is "Diversity in Peer Review". Educational events, discussions, and blogs are being organized by publishers, scholarly societies, and universities to promote diversity and inclusion in peer review. Follow @PeerRevWeek on Twitter (topic tags #PeerRevWk18, #PeerReviewWeek18 and #PeerRevDiversityInclusion).