An inputbox for an optional summary of the current edit (like mediawiki). This would then be used as the commit message, in place of "Updated foo.md".
Another idea. A checkbox to note that the current change is a minor edit (like spelling fixes) which could simply add the prefix minor to the commit message:
Minor: Updated foo.md
Minor: Fixed spelling and line break
I'd like to be able to add text to the git commit message when I save a page edit.
For instance - gitlab examines the commit message and if I mention a specific issue, it gets linked into the rest of the project.