Update README.md

README.md

@@ -124,6 +124,7 @@ But in this case only serialization is available because JSON does not contain t
 
 # Nullable reference type support
 STJ has build in support of [`required`](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/required) properties, but it just check, that value exists in JSON on deserialization and does not prevent setting `null` to none nullable properties. Fluent Api can configure `JsonSerializerOptions` to respect NRT annotations on fields and properties. Internally it uses [JsonPropertyInfo.Set](https://learn.microsoft.com/en-us/dotnet/api/system.text.json.serialization.metadata.jsonpropertyinfo.set) property and reduces deserialization performance.
+STJ will implement full NRT support in [.net9](https://github.com/dotnet/runtime/issues/100144)
 
 ```C#
 builder.RespectNullableReferenceType();
@@ -259,4 +260,4 @@ enum A
 Output:
 ```JS
 ["f",null,"third",8]
-```
+```