diff --git a/README.md b/README.md
index 86e6629..87d7354 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,13 @@ Programmatically open a native "Folder select" dialog in NW.js.
 
 Similar to `<input type="file" nwdirectory>` but with just JavaScript.
 
-Compatible with all versions of NW.js (even all the way back to 0.12.3).
+Compatible with all versions of NW.js.
+
+**Version** | **Tested**
+:--:        | :--:
+v0.12.3     | :heavy_check_mark:
+v0.14.7     | :heavy_check_mark:
+v0.40.0     | :heavy_check_mark:
 
 
 ## Installation
@@ -20,7 +26,7 @@ npm install --save nw-programmatic-folder-select
 
 ```js
 const openFolderExplorer = require('nw-programmatic-folder-select');
-openFolderExplorer((selection) => { console.log(selection); });
+openFolderExplorer(window, (selection) => { console.log(selection); });
 ```
 
 
@@ -46,6 +52,7 @@ const callback = function (selection) {
   }
 }
 
-// All arguments are optional
-openFolderExplorer(options, callback);
+// Window is required to have access to the browser context
+// All other arguments are optional
+openFolderExplorer(window, options, callback);
 ```
diff --git a/index.js b/index.js
index 93b9442..cb61dc3 100644
--- a/index.js
+++ b/index.js
@@ -1,11 +1,16 @@
 /**
  * Opens the native OS's folder selection dialog
+ * @param  {object}   window   The "window" object from the browser context. Required.
  * @param  {object}   options  Optional object for setting the title of the window and the default working directory to start in
  * @param  {Function} callback This is called when the user selects a folder or cancels the window. it will retun the path to the folder or undefined
  */
-function openFolderExplorer (options, callback) {
+function openFolderExplorer (window, options, callback) {
   // Argument validation
   var error = false;
+  if (!window || typeof(window) !== 'object') {
+    console.log('You must pass in the window object for this script to have access to the browser context.');
+    error = true;
+  }
   if (typeof(options) === 'function') {
     callback = options;
     options = null;
@@ -34,8 +39,8 @@ function openFolderExplorer (options, callback) {
   }
 
   // If element does not exist, create it and append to DOM
-  if (!document.getElementById('nwdirectory')) {
-    var inputElement = document.createElement('input');
+  if (!window.document.getElementById('nwdirectory')) {
+    var inputElement = window.document.createElement('input');
     inputElement.setAttribute('type', 'file');
     inputElement.setAttribute('id', 'nwdirectory');
     inputElement.setAttribute('nwdirectory', '');
@@ -45,11 +50,11 @@ function openFolderExplorer (options, callback) {
         callback(evt.target.value);
       }
     });
-    document.body.append(inputElement);
+    window.document.body.appendChild(inputElement);
   }
 
   // Modify element based on options
-  var element = document.getElementById('nwdirectory');
+  var element = window.document.getElementById('nwdirectory');
   if (options && options.directory) {
     element.setAttribute('nwworkingdir', options.directory);
   } else {
diff --git a/package.json b/package.json
index ded272d..686bcb5 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "nw-programmatic-folder-select",
-  "version": "1.0.1",
-  "description": "Programmatically open a native \"Folder select\" dialog in NW.js",
+  "version": "1.0.2",
+  "description": "Programmatically open a native folder select dialog in NW.js",
   "main": "index.js",
   "scripts": {
     "lint": "eslint --config=.eslintrc.js index.js",