diff --git a/main.js b/main.js
index c5e2b59..7265d4e 100644
--- a/main.js
+++ b/main.js
@@ -176,10 +176,15 @@ define(function (require, exports, module) {
 
 
     CommandManager.register(MENU_NAME, COMMAND_ID, annotate);
-    KeyBindingManager.addBinding(COMMAND_ID, "Ctrl-Alt-A");
+    KeyBindingManager.addBinding(COMMAND_ID, [{
+        "key": "Ctrl-Alt-A"
+    }, {
+        "key": "Cmd-Alt-A",
+        "platform": "mac"
+    }]);
 
     var menu = Menus.getMenu(Menus.AppMenuBar.EDIT_MENU);
     menu.addMenuDivider();
     menu.addMenuItem(COMMAND_ID);//"menu-edit-annotate", 
 
-});
\ No newline at end of file
+});