text type has no default operator class for GIN?

[Bob Gobeille <bob.gobeille@xxxxxx>]

CREATE INDEX "ufile_name_search" ON "public"."uploadtree" USING GIN  
("ufile_name");

ERROR:  data type text has no default operator class for access method  
"gin"
HINT:  You must specify an operator class for the index or define a  
default operator class for the data type.

This is on a new 8.3 install.
Why is this happening?  Isn't creating a GIN index on a text type a  
common thing to do?

I'm not seeing any mention of this in 8.3.7 docs cha 12 (Full Text  
Search).

Do I really have to CREATE OPERATOR CLASS to make this work?
I see http://www.postgresql.org/docs/8.3/interactive/sql-createopclass.html

many thanks,
bob

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