Suggest a correction

This is a reference work, and it is only as good as its sources. If a symbol is missing, a system is misdescribed, or an entry cites something that does not say what we claim, tell us.

What helps

• The entry address, if there is one.
• The source: a book with a page, an article with a link, an official document.
• What the source says, in one or two sentences, ideally quoted.

How to send it

Use the report form to record the page and the problem. The form cannot carry free text yet, so it records the entry and the kind of problem, not the source itself. A correction that names a source goes into review; nothing is published without a reviewer checking the source against the claim.

We do not publish submissions anonymously, and we do not accept edits that remove a cited disagreement in favour of one school's account.