Note by the Secretariat As referred to in the note by the Secretariat on a draft risk profile on perfluorohexane sulfonic acid (CAS No: 355-46-4, PFHxS), its salts and PFHxS-related compounds (UNEP/POPS/POPRC.14/2), the annex to the present note sets out additional information on PFHxS, its salts and PFHxS-related compounds prepared by the intersessional working group on PFHxS, its salts and PFHxS-related compounds. The present note, including its annex, has not been formally edited.