This document discusses adding QR codes to a library catalog at Kentucky State University. It begins by explaining what QR codes are and how they can store more information than conventional barcodes. It then discusses uses of QR codes outside of libraries, such as by companies and New York City for recycling information. The document outlines how the library added QR code features to their catalog by editing XML files to display a QR code linking to holding information and a button to get the information in a QR code. It concludes by discussing additional ways the library uses QR codes in outreach materials.