Keep track of your searching process in your preferred word-processing program. This will make it much easier to write your review. The better records you keep during this phase, the less stressful it will be to write your methods and results sections.
For your search in each database, record:
These resources provide guidance for how to report and write up your search process, including searches for grey literature.
For additional models of search methodology reporting, refer to see other guidelines in Guides for Conducting Systematic Reviews.