  Seidel introduced the notion of a Fukaya category `relative to an ample
divisor', explained that it is a deformation of the Fukaya category of the
affine variety that is the complement of the divisor, and showed how the
relevant deformation theory is controlled by the symplectic cohomology of the
complement. We elaborate on Seidel's definition of the relative Fukaya
category, and give a criterion under which the deformation is versal.
