diff --git a/signalr/signalr.d.ts b/signalr/signalr.d.ts
index 5f605eb5e9..617fa84eb9 100644
--- a/signalr/signalr.d.ts
+++ b/signalr/signalr.d.ts
@@ -169,12 +169,18 @@ declare namespace SignalR {
         protocol: string;
         host: string;
     }
+    
+    interface JsonConverter {
+        stringify: (o: any) => string;
+        parse: (str: string) => any;
+    }
 
     interface Connection {
         clientProtocol: string;
         ajaxDataType: string;
         contentType: string;
         id: string;
+        json: JsonConverter;
         logging: boolean;
         url: string;
         qs: string | Object;