Erreur 1075 en créan une table sour mysql

Erreur
requête SQL: 

CREATE TABLE `news` (

`id` INT( 11 ) NOT NULL AUTO_INCREMENT ,
`titre` VARCHAR( 255 ) NOT NULL ,
`contenue` TEXT NOT NULL ,
`timestamp` BIGINT( 20 ) NOT NULL DEFAULT '0'
) TYPE = MYISAM COMMENT = 'les news de mon site' 

MySQL a répondu: 

#1075 - Incorrect table definition; there can be only one auto column and it must be defined as a key