de Rooy DPC, Zhernakova A, Tsonaka R, et al. A genetic variant in the region of MMP-9 is associated with serum levels and progression of joint damage in rheumatoid arthritis. Annals of the Rheumatic Diseases 2014;73:1163-1169.

In the result section it is written ‘As depicted, carrying the minor C-allele was associated with less severe joint damage progression.’ The word minor is incorrect and should be removed, as the C-allele was not the minor allele.

All presented data are correct.

doi:10.1136/annrhemdis-2013–2 03 375