Corrections
How we fix mistakes, and how to report one.
We correct in place, and we say so
When a page is wrong we fix the page and add a dated line saying what changed. We do not quietly edit a figure and leave the page looking as though it always said that.
Where an error changed the meaning of a recommendation, the note stays at the top of the page, not in a footer.
How to report one
Email [email protected] with the page and the problem.
Conditions that have merely changed since we checked are not errors — they are a re-check, and they go in the same queue.