The following example should be correctly annotated by Scaladoc:

/**
 *
 * @param i
 * @tparam A
 */
class Foo[A](i: Int) {
  /**
   *
   * @param i
   * @return
   */
  def foo(i: Int) = i
}

But when one tries to create such a Scaladoc comment, the annotations are not automatically filled in.