Adding Custom Currency WooCommerce

add_filter( 'woocommerce_currencies', 'si_add_custom_currency' ); 
function si_add_custom_currency( $currencies ) { 
 $currencies['ABC'] = __( 'Currency name', 'woocommerce' ); 
 return $currencies;
}

add_filter('woocommerce_currency_symbol', 'si_custom_currency_symbol', 10, 2); 
function si_custom_currency_symbol( $currency_symbol, $currency ) { 
 switch( $currency ) { 
 case 'ABC': 
 $currency_symbol = '$'; 
 break; 
 } 
 return $currency_symbol;
}