Quick gist for injecting a filepath/separator into your concatted script files. You're concatting your scripts right?

Gruntfile.js

grunt.initConfig({
    concat: {
        options: {
            //Get the filepath, format it, put in whatever separator you want, and echo the script itself
            // src = the actual code of whatever your file is
            // filepath = Sandstorm, Darude
            process: function(src, filepath){
                var lines = '\n//--------------------------------------------------\n'
                var final_name = filepath.substring(filepath.lastIndexOf('/js/') + 1, filepath.length);//.join('-');
                return( lines 
                        + '// Source: ' 
                        + final_name 
                        + lines 
                        + src);
            }
        },
    }
});