The overlay lint accepted any D-number, so another issue's ruling such as "D5 (#245)" could mark a concept override. A marker now has to be a D-number with no other issue cited; the vocabulary rule that cited #245 reads "#245 decision 5". TESTING.md now states that the lint covers workspace.css only, lists the unmarked overrides still in images.css, and says PRs C and D run the lint over each page sheet they keep.