Replaced `this` with `@` in the coffee file and added an arrow that clearly marks the Notifications button as a drop down

app/assets/javascripts/project.js.coffee

@@ -27,8 +27,8 @@ class @Project
 
     $('.update-notification').on 'click', (e) ->
       e.preventDefault()
-      level = $(this).data('notification-level')
+      level = $(@).data 'notification-level'
       $('#notification_level').val(level)
       $('#notification-form').submit()
-      $(this).parents('ul').find('li.active').removeClass('active')
-      $(this).parent().addClass('active')
+      $(@).parents('ul').find('li.active').removeClass 'active'
+      $(@).parent().addClass 'active'

app/views/projects/buttons/_notifications.html.haml

@@ -7,6 +7,7 @@
       %a.dropdown-toggle.btn.btn-new{href: '#', "data-toggle" => "dropdown"}
         = icon('bell')
         Notifications
+        = icon('angle-down')
       %ul.dropdown-menu.dropdown-menu-right.project-home-dropdown
         - Notification.notification_levels.each do |level|
           = notification_list_item(level, @membership)