Change Log for Topics in Knowledge Base

Hello - we currently use Vanilla Forums to document internal policy and procedure for our contact center. We are currently using UserEcho to gather feedback from Agents on our CRM tool. In Vanilla Forums, at the admin level, I can see the change history of any topic. This is important when responding to auditors who ask when a particular policy went into affect or was changed. It also impacts our QA process on the agent calls. We have created and edited a few topics in our knowledge base but nowhere do I see a log of what was changed when and by whom. Thanks for your help.