-You can of course obtain the same results with the @code{matrix::mul()}
-and @code{matrix::trace()} methods but with indices you don't have to
-worry about transposing matrices.
+You can of course obtain the same results with the @code{matrix::add()},
+@code{matrix::mul()} and @code{matrix::trace()} methods but with indices you
+don't have to worry about transposing matrices.