Due to an editorial oversight, W.C. Sha was not made aware of the complementary work of Caamaño et al. (January 19, 1998, 187:185–196), published in the same issue of The Journal of Experimental Medicine as Franzoso et al. (187:147–159), when writing his commentary “Regulation of immune responses by NF-κB/Rel transcription factors” (187:143–146).