World Health Organisation (WHO) diagnostic manual for mental, behavioural, and neurodevelopmental disorders. The manual offers guidance to clinicians on how to diagnose disorders that have been recently added to the WHO’s ICD-11 handbook. These include complex post-traumatic stress disorder, gaming disorder and prolonged grief disorder. The aim is to offer better support to health professionals to enable them to recognise distinct clinical features of these disorders, which may previously have been undiagnosed and untreated.