The useful starting point
A typo correction and a changed factual claim have different significance. Quietly replacing an incorrect date or capability statement can leave readers unsure why an earlier copy differs. Keep a proportionate record when the change affects what the article tells them.
A small step to try
Write the corrected fact, the source supporting it and the date of the substantive update. Preserve a private editing record where appropriate, without publishing sensitive material. Distinguish new evidence from a stylistic revision. A clear correction note helps readers understand the current statement; it should not claim that every other detail has been independently verified unless that broader review actually occurred.