programatically save customization for future sessions

[emacsnews]

Hi ,
   is there any function to save a variable customization for future
   sessions (i.e. to the custom-set-variables section of my .emacs),
   or do I have to write it myself?

   Just to clarify; I know how to save a customization manually from the
   custom buffer, but I want to do this by calling a function from
   within some other elisp code.

-- 
aleblanc