The article “Surface functionalization of nanofibrillated cellulose using click-chemistry approach in aqueous media”, written by Nikolaos Pahimanolis, Ulla Hippi, Leena-Sisko Johansson, Tapio Saarinen, Nikolay Houbenov, Janne Ruokolainen and Jukka Seppälä, was originally published Online First without open access.