PRISMA is a consistent and recognised method of recording your review. Ensure you keep all relevant information for compiling the diagram.
PRISMA offer guidance and checklists. A good resource is the University of North Carolina:
https://guides.lib.unc.edu/prisma
Updated guidance at:
Page, M.J et al. (2021) "The PRISMA 2020 statement: An updated guideline for reporting systematic reviews", Journal of Clinical Epidemiology,134, pp. 178-189.