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// Adds the text element to the powerpack header components
function sp_header_components_custom_text( $components ) {
	$components['text'] = array(
	'title' => __( 'Custom Text', 'storefront-powerpack' ),
	'hook'  => 'sp_header_custom_text_output'
	);

	return $components;
}
add_filter( 'sp_header_components', 'sp_header_components_custom_text' );

// Adds text area output to the Storefront header
function sp_header_custom_text_output() {
	echo '<div class="custom-text">';

		echo 'Some custom text added to header in Storefront Powerpack';

	echo '</div>';
}
add_action( 'storefront_header', 'sp_header_custom_text_output' );