Simple_form_for - show validation errors for each field

I have a simple forms which is working well in a sense that it shows the validation error:

<%= simple_form_for( @my_model, :defaults => { :input_html => { :class => "input-xlarge" } }) do |f| %>
  <%= f.error_notification %>
  <div class="form-inputs">
    <p>
      <%= f.text_field :title, :placeholder => t("title") %>
    </p>
    ......

but it just isn't showing which of the fields are invalid. How can I make it do that?