docs: def add_milestone(self,
                        milestone,
                        codelistoid="MILESTONES"):
          """
          Add a milestone
          :param codelistoid: specify the CodeListOID (defaults to MILESTONES)
          :param str milestone: Milestone to add
          """
          if milestone not in self.milestones.get(codelistoid, []):
              self._milestones.setdefault(codelistoid, []).append(milestone)