  A classification of maximal subgroups of odd index in finite simple groups
was given by Liebeck and Saxl and, independently, Kantor in 1980s. In the cases
of alternating groups or classical groups of Lie type over fields of odd
characteristics, the classification was not complete. The classification was
completed by the author in 2008. In the cases of finite simple classical groups
of Lie type we used results obtained in Kleidman's PhD thesis. However there is
a number of flaws in this PhD thesis. The flaws were corrected by Bray, Holt,
and Roney-Dougal in 2013. In this note we provide a revision of the
classification of maximal subgroups of odd index in finite simple classical
groups over fields of odd characteristics.
