  In this paper, we present the re-analysis of a set of RXTE-PCA observations
of OAO 1657-415 during 1997 August 20-27. We found a revised timing solution
which was found to fit better to the data and updated pulse frequency values
accordingly. We also verified that there is a marginal correlation between the
gradual spin-up (or decrease in spin-down rate) and increase in X-ray
luminosity as suggested by Baykal (2000).
