diff --git a/build/background.png b/build/background.png
deleted file mode 100644
index 57016803..00000000
Binary files a/build/background.png and /dev/null differ
diff --git a/build/background.tiff b/build/background.tiff
new file mode 100644
index 00000000..b4f2d16b
Binary files /dev/null and b/build/background.tiff differ
diff --git a/js/child-preload.js b/js/child-preload.js
index 4d722cc7..6ec35104 100644
--- a/js/child-preload.js
+++ b/js/child-preload.js
@@ -1,5 +1,5 @@
 // script run before others and still has access to node integration, even
-// when turned off - also us to leak only what want into window object.
+// when turned off - allows us to leak only what want into window object.
 // see: http://electron.atom.io/docs/api/browser-window/
 //
 // to leak some node module into:
@@ -15,10 +15,9 @@ const { ipcRenderer } = require('electron');
 // hold ref so doesn't get GC'ed
 const local = {
     ipcRenderer: ipcRenderer
-}
+};
 
-// JS can detect if in wrapper mode by looking for window.SYM_API obj
-// API exposes by Symphony to a child window:
+// API exposed by Symphony to a child window:
 window.SYM_API = {
 };
 
diff --git a/js/main-preload.js b/js/main-preload.js
index fdc9909a..8bc69852 100644
--- a/js/main-preload.js
+++ b/js/main-preload.js
@@ -1,5 +1,5 @@
 // script run before others and still has access to node integration, even
-// when turned off - also us to leak only what want into window object.
+// when turned off - allows us to leak only what want into window object.
 // see: http://electron.atom.io/docs/api/browser-window/
 //
 // to leak some node module into:
@@ -15,10 +15,9 @@ const { ipcRenderer } = require('electron');
 // hold ref so doesn't get GC'ed
 const local = {
     ipcRenderer: ipcRenderer
-}
+};
 
-// JS can detect if in container mode by looking for window.SYM_API obj
-// API exposes by Symphony to main window:
+// API exposed by Symphony to main window:
 window.SYM_API = {
     openWindow: function(url) {
         local.ipcRenderer.send('symphony-msg', {
diff --git a/js/main.js b/js/main.js
index ccaf9bdd..d98c13b8 100644
--- a/js/main.js
+++ b/js/main.js
@@ -76,6 +76,10 @@ function createMainWindow () {
     });
 }
 
+/**
+ * Generate a key (guid).
+ * @return {string} guid
+ */
 function getWindowKey() {
     // generate guid:
     // http://stackoverflow.com/questions/105034/create-guid-uuid-in-javascript
@@ -113,6 +117,10 @@ function isValidWindow(event) {
     return false;
 }
 
+/**
+ * Handle ipc messages from renderers. Only messages from windows we have
+ * created are allowed.
+ */
 electron.ipcMain.on('symphony-msg', (event, arg) => {
     if (!isValidWindow(event)) {
         console.log('invalid window try to perform action, ignoring action.');
@@ -143,9 +151,11 @@ electron.ipcMain.on('symphony-msg', (event, arg) => {
     }
 });
 
-// This method will be called when Electron has finished
-// initialization and is ready to create browser windows.
-// Some APIs can only be used after this event occurs.
+/**
+ * This method will be called when Electron has finished
+ * initialization and is ready to create browser windows.
+ * Some APIs can only be used after this event occurs.
+ */
 app.on('ready', function() {
     createMainWindow();
 });
diff --git a/package.json b/package.json
index 0b45222d..a3dc1bb5 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,12 @@
         "target": "dmg",
         "category": "public.app-category.business"
     },
+    "dmg": {
+        "contents": [
+            { "x": 140, "y": 184 },
+            { "x": 412, "y": 184, "type": "link", "path": "/Applications" }
+        ]
+    },
     "win": {
         "target": "squirrel"
     }