diff --git a/state-machine/state-machine.d.ts b/state-machine/state-machine.d.ts
index 1f5ddb7612..b3f5446531 100644
--- a/state-machine/state-machine.d.ts
+++ b/state-machine/state-machine.d.ts
@@ -1,6 +1,6 @@
-// Type definitions for Finite State Machine 2.2
+// Type definitions for Finite State Machine 2.3.5
 // Project: https://github.com/jakesgordon/javascript-state-machine
-// Definitions by: Boris Yankov <https://github.com/borisyankov/>, Maarten Docter <https://github.com/mdocter>, William Sears <https://github.com/MrBigDog2U>
+// Definitions by: Boris Yankov <https://github.com/borisyankov/>, Maarten Docter <https://github.com/mdocter>, William Sears <https://github.com/MrBigDog2U>, samael <https://github.com/samael65535>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 interface StateMachineErrorCallback {
@@ -27,9 +27,13 @@ interface StateMachineConfig {
     error?: StateMachineErrorCallback;
 }
 
+interface StateMachineIsFinished {
+    (state: string): boolean;
+}
+
 interface StateMachineStatic {
 
-    VERSION: string; 		        // = "2.2.0"
+    VERSION: string; 		        // = "2.3.5"
     WILDCARD: string;		        // = '*'
     ASYNC: string;			        // = 'async'   
 
@@ -37,7 +41,7 @@ interface StateMachineStatic {
         SUCCEEDED: number;	        // = 1, the event transitioned successfully from one state to another
         NOTRANSITION: number;	    // = 2, the event was successfull but no state transition was necessary
         CANCELLED: number;	        // = 3, the event was cancelled by the caller in a beforeEvent callback
-        ASYNC: number;		        // = 4, the event is asynchronous and the caller is in control of when the transition occurs
+        PENDING: number;		        // = 4, the event is asynchronous and the caller is in control of when the transition occurs
     };
 
     Error: {
@@ -68,7 +72,7 @@ interface StateMachine {
     can: StateMachineCan;
     cannot: StateMachineCan;
     error: StateMachineErrorCallback;
-
+	isFinished: StateMachineIsFinished;
     /*  transition - only available when performing async state transitions; otherwise null. Can be a: 
         [1] fsm.transition(); // called from async callback
         [2] fsm.transition.cancel();