Material Corrections
A visible correction note is appropriate when an earlier version contained a meaningful factual or technical error. Examples include a wrong formula, incorrect conversion, mistaken battery specification, misidentified standard, reversed comparison, unsupported safety statement, or a sentence whose original wording materially changed the conclusion.
Where practical, the note should state the nature of the correction in plain language. The purpose is not to preserve every previous sentence forever; it is to give readers enough context to understand that a significant error existed and has been fixed.
Minor edits normally do not receive a correction notice
Spelling, grammar, formatting, broken internal links, improved headings and other edits that do not alter substantive meaning may be corrected without a formal note. If a typographical error changes a number, unit or conclusion, however, it is treated as substantive rather than cosmetic.