diff --git a/bumblebee/modules/todo.py b/bumblebee/modules/todo.py
index 04cd256..b26d7c7 100644
--- a/bumblebee/modules/todo.py
+++ b/bumblebee/modules/todo.py
@@ -21,11 +21,12 @@ class Module(bumblebee.engine.Module):
         )
         self._doc = os.path.expanduser(self.parameter("file", "~/Documents/todo.txt"))
         self._todos = self.count_items()
+        engine.input.register_callback(self, button=bumblebee.input.LEFT_MOUSE, cmd="xdg-open {0}".format(self._doc))
 
 
     def output(self, widget):
-       self._todos = self.count_items()
-       return str(self._todos)
+        self._todos = self.count_items()
+        return str(self._todos)
 
 
     def state(self, widgets):