The city shall include all territory encompassed by its boundaries as they now exist or hereafter are modified by voters, by the council, or by any other agency with the legal power to modify them. The recorder shall keep in his office, at the city hall, at least two copies of this charter in each of which he shall maintain an accurate, up-to-date description of the boundaries. The copies and descriptions shall be available for public inspection at any time during regular office hours of the recorder.