  We give the geralized expression of spin precession of extended bunch
particles having both anomalous magnetic and electric dipole moments in storage
ring in higher order than the previous work and in the presence of ${\bf E}$
field as well as ${\bf B}$ field. These addenda are essential since some
experiments consider the focusing field in the second order of the beam extent
and in the presence of both ${\bf B}$ and ${\bf E}$ fields . It is shown that
some focusing fields with constant magnitude of the velocity considered in many
literatures lead to the violation of self consistency.
