diff --git a/README.md b/README.md
index a885dac..76459b9 100644
--- a/README.md
+++ b/README.md
@@ -60,9 +60,11 @@ curl https://bgpranking-ng.circl.lu/ipasn_history/?ip=143.255.153.0/24
 
 ## Get the ranking of the AS
 ```
-curl -X POST -d '{"asn": "5577"}' https://bgpranking-ng.circl.lu/json/asn
+curl -X POST -d '{"asn": "5577", "date": "2019-05-19"}' https://bgpranking-ng.circl.lu/json/asn
 ```
 
+Note: `date` isn't required.
+
 ## Response
 
 ```json