Icons on bootstrap accordion

Hello I can see that you have some toggles in the demo that change icon on open/collapse. I am however using the bootstrap accordion similar to your demo with an icon. Like this:

<div id="accordion" role="tablist">
	<div class="card">
		<div class="card-header" role="tab" id="headingSt">
			<h3 class="mb-0">
			<a data-toggle="collapse" href="#Starters" aria-expanded="true" aria-controls="St" class="">
				St<span class="float-right"><i class="icon-caret-down"></i></span>
			</a>
			</h3>
		</div>
...

Do you have built-in functionality to change icon on collapse? e.g. change icon-caret-down to icon-caret-up?

Cheers