An error occurred in the March issue of the journal (Richette P, Dumontier M-F, Tahiri K, Widerak M, Torre A, Benallaloua M, et al. Oestrogens inhibit interleukin 1ß-mediated nitric oxide synthase expression in articular chondrocytes through nuclear factor-B impairment. Ann Rheum Dis 2007;66:345–50.) The correct spelling of the sixth author’s name is Mourad Benallaoua. The online version has been amended and differs from the print version.