Construction on C line in Paris

In October 2013 on the weekends the RER C line to Versaiiles ends at Issy, due to construction, where you are bussed to Gare de Bellevue to take the train to the Versailles Chainters station. Recommend you catch a train at Gare de Montparnasse for Versailles on the weekends. Do not forget to buy return tickets. Mike