law: 15. Power of President to add to the service for pension.-
  The President may, for special reasons, direct that any period not exceeding three months shall be added to the service for pension of a Judge, and any such period so added shall count for pension purposes-
  (a) in the case of a Judge who has served in the Supreme Court as Chief Justice, as service as Chief Justice; and
  (b) in the case of any other Judge, as service as any other Judge.