Minor Edit
On the page edit form, the "minor edit" checkbox allows you to indicate that the changes you are making are just minor (such as correcting spelling mistakes, changing keywords, making the page look right...) and are thus not worth logging to RecentChanges.
This helps to keep RecentChanges tidy.
If you only change the way a page looks, it is a minor edit. If you add, change or remove content, it isn't.
To ignore this distinction and view all recent changes, major or minor, visit FullRecentChanges.
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SirLyric: Why is it that when I make a major edit, giving it a useful comment, then notice a tiny mistake and make a minor edit, checking the box that says "don't log it to RecentChanges", the comment that shows on RecentChanges is the comment of the later, minor edit?