In the paper 'Cosmic clocks: a tight radius - velocity relationship forHI-selected galaxies', by G. R. Meurer et al. (2009), 695, 765, the journal listed in 31 entries in the references section was incorrectly given as 'Ap & SS' (Astrophysics and Space Science) when they should have been listed as 'ApJ' (the Astrophysical Journal). These correspond to all cases in the original paper with the journal listed as 'Ap & SS'. The mistake arose in software we used to process the bibliography. The revised references for the incorrect entries are given below.