gistfile1.txt

// Adding field to /libs/class-acffcb-fields.php
// https://github.com/MWDelaney/acf-flexible-content-blocks/issues/4
  
function subtitle($thisKey = 'field') {
	return(
		array (
			'key' => $this->key . '-' . $thisKey . '-' . __FUNCTION__,
			'label' => 'Subtitle',
			'name' => 'block_subtitle',
			'type' => 'text',
			'instructions' => '',
			'required' => 0,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '',
			        'class' => 'acf-subtitle',
			        'id' => '',
			),
			'default_value' => '',
			'placeholder' => '',
			'prepend' => '',
			'append' => '',
			'maxlength' => '',
			'readonly' => 0,
			'disabled' => 0,
		)
	);
}