U.S. Supreme Court Justice Elena Kagan thinks American law schools—including those in the top tier—need to “think in a deep way” about how to help their students become better writers.

In an interview conducted last month by legal writing expert Bryan Garner, Kagan, who once taught at the University of Chicago Law School and was dean of Harvard Law School, said that for “too many students,” even at the schools she worked at, “nobody taught them” writing skills. She acknowledged that “writing is one of the hardest things to teach.”