'Add a break element of *break_type* to this run. *break_type* can
take the values `WD_BREAK.LINE`, `WD_BREAK.PAGE`, and
`WD_BREAK.COLUMN` where `WD_BREAK` is imported from `docx.enum.text`.
*break_type* defaults to `WD_BREAK.LINE`.'

def add_break(self, break_type=WD_BREAK.LINE):

    (type_, clear) = {WD_BREAK.LINE: (None, None), WD_BREAK.PAGE: (u'page', None), WD_BREAK.COLUMN: (u'column', None), WD_BREAK.LINE_CLEAR_LEFT: (u'textWrapping', u'left'), WD_BREAK.LINE_CLEAR_RIGHT: (u'textWrapping', u'right'), WD_BREAK.LINE_CLEAR_ALL: (u'textWrapping', u'all')}[break_type]
    br = self._r.add_br()
    if (type_ is not None):
        br.type = type_
    if (clear is not None):
        br.clear = clear
