This corrigendum corrects changes necessary to the existing C code (Release 2.0) that is supplied with ITU-T Rec. G.722.1 Annex B. No changes are made to the textual part of the Recommendation. For convenience of users, this Corrigendum has been integrated into the base text of the Recommendation, changing for consistency the designation of the C code to Release 2.1. For access to the code in compilable form, please see http://www.itu.int/rec/T-REC-G.722.1-200505-I.