  In Ref.1 (Physical Review B 80, 041304(R) (2009)), we reported an estimate of
the critical exponent for the divergence of the localization length at the
quantum Hall transition that is significantly larger than those reported in the
previous published work of other authors. In this paper, we update our finite
size scaling analysis of the Chalker-Coddington model and suggest the origin of
the previous underestimate by other authors. We also compare our results with
the predictions of L\"utken and Ross (Physics Letters B 653, 363 (2007)).
