In Abaqus 2D axisymmetric model, "xsymm" boundary condition is needed?

Hi, I am doing an axisymmetric model of a diaphragm fixed along the circumference and uniform pressure acting on it from one side. As I am using 2D axisymmetric model, do I have to choose "xsymm" boundary condition at the center of the diaphragm? Abaqus FEA  Abaqus AXISYMMETRIC