local option to global

I'm using vim 7.4.457 on Windows 7.
I am editing a lot of text files on the same window. In one of the
buffers I use ':set comments+=n:>' but when I go to the next file, this
setting is lost. How can I make it global?
I tried to use ':setg comments+=n:>' but it is of no avail.

Many thanks in advance,

--
Cesar

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