  The effect of the transverse self-force in a relativistic beam has been
studied in the earlier paper of the author [1]. However, the analysis of [1]
missed an important observation and has lead to an incorrect estimate of the
emittance growth of the beam when it passes through a long bending magnet. Here
we correct that analysis. In particular, we conclude that the emittance growth
due to the transverse self-force in a long bend is always much smaller than the
emittance growth due to the longitudinal coherent synchrotron radiation (CSR)
wake.
