Why wont this update work?

Hi,
trying to get this to work with pgsql, but it refuses to do anything...

the table is called catalog. The field is called language and is a
varchar(3) field.
81 of the records have the letter 'E' in the language field. i want to
put 'NoD' in the rest.

UPDATE catalog
SET language = 'NoD'
WHERE NOT language = 'E';

nor does

UPDATE catalog
SET language = 'NoD'
WHERE language = 'NULL'; ........ or NULL and so on.

I can change the 81 letter 'E's to anything I like, but can not UPDATE the
blank fields..

can anyone tell me what I am missing here please?

Thanks
Bob

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