multiple APIs available and highlight the most important "route optimization"

README.md

@@ -1741,7 +1741,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Compare Flight Prices](https://rapidapi.com/obryan-software-obryan-software-default/api/compare-flight-prices/) | API for comparing flight prices across platforms | `apiKey` | Yes | Unknown |
 | [CTS](https://api.cts-strasbourg.eu/) | CTS Realtime API | `apiKey` | Yes | Yes |
 | [Grab](https://developer.grab.com/docs/) | Track deliveries, ride fares, payments and loyalty points | `OAuth` | Yes | Unknown |
-| [GraphHopper](https://docs.graphhopper.com/) | A-to-B routing with turn-by-turn instructions | `apiKey` | Yes | Unknown |
+| [GraphHopper Directions API](https://docs.graphhopper.com/) | Route Optimization API and A-to-B routing with turn-by-turn instructions | `apiKey` | Yes | Unknown |
 | [Icelandic APIs](http://docs.apis.is/) | Open APIs that deliver services in or regarding Iceland | No | Yes | Unknown |
 | [Impala Hotel Bookings](https://docs.impala.travel/docs/booking-api/) | Hotel content, rates and room bookings | `apiKey` | Yes | No |
 | [Izi](http://api-docs.izi.travel/) | Audio guide for travellers | `apiKey` | Yes | Unknown |