After the certification of a zone plan from the regional planning commission and before the enactment of any such zoning ordinance, the county legislative body shall hold a public hearing thereon, the time and place of which at least thirty (30) days' notice shall be given by one (1) publication in a newspaper of general circulation in the county. Such notice shall state the place at which the text and maps as certified by the planning commission may be examined. No change in or departure from the text or maps as certified by the regional planning commission shall be made, unless such change or departure be first submitted to the certifying regional planning commission for its approval, disapproval or suggestions, and, if disapproved, shall receive the favorable vote of a majority of the entire membership of the county legislative body. Such planning commission shall have thirty (30) days from and after such submission within which to send its report to the county legislative body. The entire text of a zoning ordinance need not be published in a newspaper. It is sufficient notice if the caption and a complete summary are published at least once in the official newspaper of the county or in a newspaper of general circulation in the county. The summary shall include a statement that a complete copy of the zoning ordinance is available and where such copy may be obtained. The ordinance shall not be in force until the required publication is made. If the zoning ordinance rezones property, a description of the property that is rezoned shall be included in the summary.