Documenting String.prototype functions

[Tomasz Jama]

I have a code like this in Foo module:

 String.prototype.capitaliseFirstLetter = function() {

    return this.charAt(0).toUpperCase() + this.slice(1);

  };

I tried documenting it like this:

/**

     * Capitalize first letter of string

     * @method ucfirst

     * @for String

     */

but it doesn't show up in module view. Is it possible?