The Oviedo Convention provides in its Article 31 that “Protocols may be concluded … with a view to developing, in specific fields, the principles contained in the Convention.” 

At its 40th plenary meeting (21-23 June 2011), Committee on Bioethics (DH-BIO) agreed to include the elaboration of an Additional Protocol concerning the protection of human rights and dignity of persons with mental disorders in the work program.