Marcel Proust, A Biography, Jean-Yves Tadié: "He acquired such a taste for this that he announced a sequel, in which he planned to include a second portrait of Princesse Soutzo, 'given the position she had occupied' in his life over two years, as well as portraits of Mme de Chevigné and Morand."
Marcel Proust, George D. Painter: "He promised, 'in another part of these memoirs which will be chiefly consecrated to Mme de Chevigné', to speak further of Princesse Soutzo and Mme Straus, and the pastiche ends with the words 'to be continued'. But this sequel, which he intended to publish at the same time as Le Côté de Guermantes, mentioned frequently and probably began, remains still unknown."