In the central folios (70v-1r) of Cambridge, University Library, Ff.6.33, is a reddish-brown discolouration, rectangular in size, which seems to have bled through the material, faded but still visible on one bifolium. The mark resists immediate classification as a spillage or other such accidental damage and thus raises the question of how we might interpret such markings. Has the manuscript been used to store an item flat? Is it a mark left by a historical binding? Or is it 'reader's residue', perhaps an imprint of a bookmark or an item directly related to the contents of the collection of texts, which combines to form a matrix of reading apparatus? I am interested in this last possibility and, given the information available about the manuscript regarding its provenance, ordinatio, and scribe, think it a worthy thought experiment to consider how a particular item-possibly a pilgrim badge-might have augmented the use of the manuscript for its intended reader.Cambridge University Library, Ff.6.33 (henceforth F) is a collection of devotional texts, written in the late fifteenth or early sixteenth century. The materials within include texts such as The boke of the XII patriarkys, indulgences of Pope John XII, an exposition on the Pater Noster, the Latin Ave Maria followed by an English translation, the Treatise on the Nine Virtues, a translation of the Rule of St. Augustine, the Ladder of Foure Ronges (a translation of the Scala Claustralium), and most significantly for our inquiry, The Rewyll of Seynt Sauioure, the Middle English Rule of St. Bridget of Sweden. The manuscript is small (176 x 130mm), unembellished and in good condition, with blue and red ink used for simply elaborated initials and paraph markers. There are neither signs of marginalia nor illuminations, rendering F a simple and compact devotional tool.