Provided that if two or more States agree that the Hindi language should be the official language for communication

Special provision relating to language spoken by a section of the population of a State.—On a demand being made in that behalf the President may, if he is satisfied that a substantial proportion of the population of a State desire the use of any language spoken by them to be recognised by that State, direct that such language shall also be officially recognised throughout that State or any part thereof for such purpose as he may specify.