Yes, I suspect it was Brook's performances which meant this popped up on my timeline.
Nice stat I've just seen.
Brook has played 9 innings in tests so far (his 9th is still in progress). No other player in test history has scored more runs after 9 innings. He currently has 807 runs - that may increase as he resumes this evening our time. The previous record was 798 runs in 9 innings.
Another potential milestone would be fewest innings to achieve 1000 runs in tests. Currently that stands at 12.