Documentation bug?

Hello all,

I just noticed that you can do something like this (using 9.4.1):

   select array[1,2,3] - 3

which is doing the same thing as:

   select array_remove(array[1,2,3],3)

but the minus is not documented as an array operator:
http://www.postgresql.org/docs/current/static/functions-array.html 

Is that an oversight in the documentation or isn't the minus supposed to work like that in the first place?

Regards
Thomas