7 – Web form submission limit message reached for anonymous users

I have a Drupal 7 web form that anonymous users can complete twice a day (think of a basic type of participation form in the competition). However, when they reach their shipping limit for the day the web form simply disappears, without any message indicating that they have reached their daily limit.

Before writing my own module to do this, is there any link I can use to facilitate the addition of a message? I would have assumed that something like this would be standard in the web form module, since the limit is set by the module.