form array

i've created file upload scripts in the past that allows multi-upload inputs using the bracket [] array in form. so now i have to create the same type of script but each file input field will also be followed by a text box for a "file caption" type thing. what would i used for the input text box? file: <input type="file" name="foo[]"> now for my text field? <input type="text" name="??"> something like foo[caption][] ?