Problem with UPDATE query

How can I update several columns in one UPDATE query ?
The users's guide says:

UPDATE table SET col = expression [, ...]
[ FROM fromlist ]
[ WHERE condition ]

But this is what I get:

jd=> CREATE TABLE foo (v1 INT2, v2 INT2, v3 INT2 );
CREATE
jd=> insert into foo values(1,2,3);
INSERT 22187 1
jd=> UPDATE foo SET v2=3 , SET v3=4 WHERE v1=1 ;
ERROR: parser: parse error at or near "v3"
jd=>

Thanks

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