@@ -21,6 +21,7 @@ describe("useStableCallback", () => {
   // child must still reach the handler of the render it commits with.
   it("calls the committing render's function from a child layout effect", async () => {
     const seen: string[] = [];
+    // A plain hook test; a router would add its own commits around the rerender.
     await using screen = await render(<Parent value="first" seen={seen} />, { router: false });
     await screen.rerender(<Parent value="second" seen={seen} />);
     expect(seen).toEqual(["first->first", "second->second"]);