diff --git a/signalr/signalr.d.ts b/signalr/signalr.d.ts
index 6fe6b87896..ea150d71f9 100644
--- a/signalr/signalr.d.ts
+++ b/signalr/signalr.d.ts
@@ -8,6 +8,13 @@
 
 
 declare namespace SignalR {
+    
+    const enum ConnectionState {
+        Connecting = 0,
+        Connected = 1,
+        Reconnecting = 2,
+        Disconnected = 4
+    }
 
     interface AvailableEvents {
         onStart: string;