diff --git a/types/graphql/execution/execute.d.ts b/types/graphql/execution/execute.d.ts
index 6d02b82124..c8ee7d9215 100644
--- a/types/graphql/execution/execute.d.ts
+++ b/types/graphql/execution/execute.d.ts
@@ -28,11 +28,13 @@ export interface ExecutionContext {
 
 /**
  * The result of execution. `data` is the result of executing the
- * query, `errors` is null if no errors occurred, and is a
+ * query, `extensions` represents additional metadata, `errors` is
+ * null if no errors occurred, and is a
  * non-empty array if an error occurred.
  */
 export interface ExecutionResult {
     data?: { [key: string]: any };
+    extensions?: { [key: string]: any };
     errors?: GraphQLError[];
 }
 
diff --git a/types/graphql/index.d.ts b/types/graphql/index.d.ts
index b65245a33e..74d9224242 100644
--- a/types/graphql/index.d.ts
+++ b/types/graphql/index.d.ts
@@ -8,6 +8,7 @@
 //                 Mikhail Novikov <https://github.com/freiksenet>
 //                 Ivan Goncharov <https://github.com/IvanGoncharov>
 //                 Hagai Cohen <https://github.com/DxCx>
+//                 Ricardo Portugal <https://github.com/rportugal>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3