(defcustom custom-file nil
"File used for storing customization information.
The default is nil, which means to use your init file
-as specified by `user-init-file'. If you specify some other file,
-you need to explicitly load that file in order for
-the settings it contains to take effect. You might want to
-put code in your init file to load it: `(load \"CUSTOM-FILENAME\")'.
+as specified by `user-init-file'.
When you change this variable, look in the previous custom file
\(usually your init file) for the forms `(custom-set-variables ...)'