diff --git a/types/acl/index.d.ts b/types/acl/index.d.ts
index 3aa81de8e3..43de3f5369 100644
--- a/types/acl/index.d.ts
+++ b/types/acl/index.d.ts
@@ -50,7 +50,10 @@ interface Acl {
     allowedPermissions: (userId: Value, resources: strings, cb?: AnyCallback) => Promise<void>;
     isAllowed: (userId: Value, resources: strings, permissions: strings, cb?: AllowedCallback) => Promise<boolean>;
     areAnyRolesAllowed: (roles: strings, resource: strings, permissions: strings, cb?: AllowedCallback) => Promise<any>;
-    whatResources: (roles: strings, permissions: strings, cb?: AnyCallback) => Promise<any>;
+    whatResources: {
+        (roles: strings, cb?: AnyCallback): Promise<any>;
+        (roles: strings, permissions: strings, cb?: AnyCallback): Promise<any>;
+    }
     permittedResources: (roles: strings, permissions: strings, cb?: Function) => Promise<void>;
     middleware: (numPathComponents?: number, userId?: Value | GetUserId, actions?: strings) => express.RequestHandler;
 }
diff --git a/types/acl/test/index.ts b/types/acl/test/index.ts
index c29574326d..bb3e6fa54e 100644
--- a/types/acl/test/index.ts
+++ b/types/acl/test/index.ts
@@ -66,6 +66,18 @@ acl.isAllowed('joed', 'blogs', 'view', (err, res) => {
     }
 });
 
+acl.whatResources('foo', (err, res) => {
+    if (res) {
+        console.log(res);
+    }
+});
+
+acl.whatResources('foo', 'view', (err, res) => {
+    if (res) {
+        console.log(res);
+    }
+});
+
 acl.isAllowed('jsmith', 'blogs', ['edit','view','delete'])
 .then((result) => {
   console.dir('jsmith is allowed blogs ' + result);