Is there a way to pass params when clicking submit button in simple_form view in rails 3.2.12?

In simple_form view, the submit button is like this:

<%= f.button :submit, 'Save' %>

We are trying to pass a params subaction when clicking the Save button. The params[:subaction] should have value of 'update' after clicking the button. Here is what we tried in view but it did not work:

<%= f.button :submit, 'Save', :subaction => 'update' %>

Is there a way to pass a value in params[:subaction] when clicking the Save button?