diff --git a/parsimmon/parsimmon-tests.ts b/parsimmon/parsimmon-tests.ts
index d1f3d4e6b4..3f80198917 100644
--- a/parsimmon/parsimmon-tests.ts
+++ b/parsimmon/parsimmon-tests.ts
@@ -3,6 +3,7 @@
 import P = require('parsimmon');
 import Parser = P.Parser;
 import Mark = P.Mark;
+import Result = P.Result;
 
 // --  --  --  --  --  --  --  --  --  --  --  --  --
 
@@ -17,6 +18,7 @@ class Bar {
 // --  --  --  --  --  --  --  --  --  --  --  --  --
 
 var str: string;
+var bool: boolean;
 var num: number;
 var regex: RegExp;
 
@@ -50,7 +52,16 @@ var fooMarkPar: Parser<Mark<Foo>>;
 
 // --  --  --  --  --  --  --  --  --  --  --  --  --
 
-foo = fooPar.parse(str);
+var fooResult: Result<Foo>;
+
+bool = fooResult.status;
+foo = fooResult.value;
+str = fooResult.expected;
+num = fooResult.index;
+
+// --  --  --  --  --  --  --  --  --  --  --  --  --
+
+fooResult = fooPar.parse(str);
 
 fooPar = fooPar.or(fooPar);
 anyPar = fooPar.or(barPar);
diff --git a/parsimmon/parsimmon.d.ts b/parsimmon/parsimmon.d.ts
index 2bf24cba79..719e9c937d 100644
--- a/parsimmon/parsimmon.d.ts
+++ b/parsimmon/parsimmon.d.ts
@@ -1,5 +1,5 @@
-// Type definitions for Parsimmon 0.4.0
-// Project: https://github.com/jayferd/parsimmon
+// Type definitions for Parsimmon 0.5.0
+// Project: https://github.com/jneen/parsimmon
 // Definitions by: Bart van der Schoor <https://github.com/Bartvds>
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
@@ -14,11 +14,18 @@ declare module 'parsimmon' {
 			value: T;
 		}
 
+		export interface Result<T> {
+			status: boolean;
+			value?: T;
+			expected?: string;
+			index?: number;
+		}
+
 		export interface Parser<T> {
 			/*
 			 parse the string
 			 */
-			parse(input: string): T;
+			parse(input: string): Result<T>;
 			/*
 			 returns a new parser which tries parser, and if it fails uses otherParser.
 			 */