'Sir John Alexander Ferguson's Bibliography of Australia is the fundamental reference for all printed matter relating to Australia between the years 1784 and 1900. The author aimed at nothing less than a comprehensive listing of every published item that fell within its scope. Inevitably though, as Ferguson well knew, there would be additional works and editions found. Volumes II, III and IV of the Bibliography contain addenda, including entries for titles not recorded in earlier volumes. In 1986 the National Library of Australia published a single volume of Addenda 1784-1850 Volumes I to IV, incorporating addenda interspersed through volumes II to IV, with further corrections, notes, and other information, much of which derived from the annotated seven-volume bound set of the publication, found in the Papers of J. A. Ferguson, now in the National Library of Australia. The present note records one further title omitted from the published addenda: a 1791 Belgian imprint in the Mitchell Library, Sydney.' (Publication abstract)