An idea: Give your documents an expiration date.
It's somewhat common to include a "written on" date in documents. But what about an expiration date?
If you're reading a document and it has expired, it is your responsibility to determine if its contents are still correct and valid.
Correct means the contents are still an accurate representation of a system, and valid means the document still applies to the current business environment.
If it's not correct, you update the document.
If it's not valid, you delete the document.