correct alg1 description in README

README.md

@@ -25,7 +25,7 @@ $$
 
 where $\tilde{\nabla} f(x)$ is the SVRG stochastic gradient of a subset and
 $P$ is a diagonal preconditioner calculated as the harmonic mean of
-$x / A^T 1$ and the diagonal of the Hessian of the RDP, as proposed
+$x / A^T 1$ and the inverse of diagonal of the Hessian of the RDP, as proposed
 in work of Nuyts et al.
 The scalar step size $\alpha$ is set to 3 in the first epochs and then decreased
 to 1 and finally to 0.5 in late epochs.