diff --git a/types/node-dir/index.d.ts b/types/node-dir/index.d.ts
index 5d3a31034a..d5892661b8 100644
--- a/types/node-dir/index.d.ts
+++ b/types/node-dir/index.d.ts
@@ -1,6 +1,7 @@
 // Type definitions for node-dir
 // Project: https://github.com/fshost/node-dir
 // Definitions by: Panu Horsmalahti <https://github.com/panuhorsmalahti>
+//                 James Lismore <https://github.com/jlismore>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 ///<reference types="node"/>
@@ -66,6 +67,8 @@ export function readFiles(dir: string, options: Options, fileCallback: FileNamed
 export function readFilesStream(dir: string, streamCallback: StreamCallback, finishedCallback?: FinishedCallback): void;
 export function readFilesStream(dir: string, options: Options, streamCallback: StreamCallback, finishedCallback?: FinishedCallback): void;
 export function files(dir: string, callback: (error: any, files: string[]) => void): void;
+export function files(dir: string, syncOption: { sync: true }): string[];
+export function promiseFiles(dir: string): Promise<string[]>;
 export function subdirs(dir: string, callback: (error: any, subdirs: string[]) => void): void;
 export function paths(dir: string, callback: (error: any, paths: PathsResult) => void): void;
 export function paths(dir: string, combine: boolean, callback: (error: any, paths: string[] | PathsResult) => void): void;
diff --git a/types/node-dir/node-dir-tests.ts b/types/node-dir/node-dir-tests.ts
index 7374b45d8d..4c23c9887f 100644
--- a/types/node-dir/node-dir-tests.ts
+++ b/types/node-dir/node-dir-tests.ts
@@ -74,6 +74,14 @@ dir.files("./", function(err, files) {
     });
 });
 
+dir.files("./", { sync: true }).map(file => console.log(file.toLowerCase()));
+
+dir.promiseFiles("./")
+    .then(files => {
+        console.log(files);
+    })
+    .catch(e => console.error(e));
+
 dir.subdirs("./", function(err, subdirs) {
     console.log(subdirs);
 });