Plenty of studies have demonstrated the association between Morvan syndrome and antibodies to voltage-gated potassium channels (VGKC-Ab) including contactin associated protein-like 2 antibodies (CASPR2-Ab), leucine-rich glioma inactivated protein 1 antibodies (LGI1-Ab) and other antibodies [2, 4–8]. Here, CNTNAP2 is linked to Morvan syndrome.