The margins of Indian manuscripts have attracted very little scholarly attention to date. The present paper is aimed at showing, through the example of Kashmirian Sanskrit manuscripts, that Classical Indology has much to gain by studying marginal annotations, first and foremost because the latter often include substantial quotations of texts that are no longer extant, so that they constitute a unique source enabling us to retrieve significant parts (which may amount to several chapters) of lost works. These marginalia also provide us with an opportunity to understand how certain texts came to be marginalized in the course of time despite their innovative character and the intense exegetic or critical reaction that they might have initially triggered; and they may afford us some rare glimpses into the practical aspects of intellectual life – particularly learning and teaching habits – in medieval India. (https://paris3.academia.edu/IsabelleRati%C3%A9)