The Cochrane Handbook highlights the importance of documenting and recording the search process:
"The search process (including the sources searched, when, by whom, and using which terms) needs to be documented in enough detail throughout the process to ensure that it can be reported correctly in the review, to the extent that all the searches of all the databases are reproducible."
PRISMA provides a structured approach to reporting systematic reviews (and meta-analyses). There is a checklist outlining the sections to include in your report, and a flowchart to record the number of records retained at each step in the review process.