diff --git a/spec/atom-spec.coffee b/spec/atom-spec.coffee
index 6cad8c52e..2c1a40afc 100644
--- a/spec/atom-spec.coffee
+++ b/spec/atom-spec.coffee
@@ -47,9 +47,8 @@ describe "the `atom` global", ->
         updateAvailableHandler.callCount > 0
 
       runs ->
-        {releaseVersion, releaseNotes} = updateAvailableHandler.mostRecentCall.args[0]
+        {releaseVersion} = updateAvailableHandler.mostRecentCall.args[0]
         expect(releaseVersion).toBe 'version'
-        expect(releaseNotes).toBe 'notes'
 
   describe "loading default config", ->
     it 'loads the default core config', ->
diff --git a/src/browser/auto-update-manager.coffee b/src/browser/auto-update-manager.coffee
index f1f782d10..dfbdacfc4 100644
--- a/src/browser/auto-update-manager.coffee
+++ b/src/browser/auto-update-manager.coffee
@@ -47,7 +47,7 @@ class AutoUpdateManager
       @setState(ErrorState)
       console.error "Error Downloading Update: #{message}"
 
-    autoUpdater.on 'update-downloaded', (event, @releaseNotes, @releaseVersion) =>
+    autoUpdater.on 'update-downloaded', (event, releaseNotes, @releaseVersion) =>
       @setState(UpdateAvailableState)
       @emitUpdateAvailableEvent(@getWindows()...)
 
@@ -61,9 +61,9 @@ class AutoUpdateManager
         @setState(UnsupportedState)
 
   emitUpdateAvailableEvent: (windows...) ->
-    return unless @releaseVersion? and @releaseNotes
+    return unless @releaseVersion?
     for atomWindow in windows
-      atomWindow.sendMessage('update-available', {@releaseVersion, @releaseNotes})
+      atomWindow.sendMessage('update-available', {@releaseVersion})
 
   setState: (state) ->
     return if @state is state
diff --git a/src/window-event-handler.coffee b/src/window-event-handler.coffee
index 708dcc555..37c04670b 100644
--- a/src/window-event-handler.coffee
+++ b/src/window-event-handler.coffee
@@ -31,8 +31,8 @@ class WindowEventHandler
           atom.updateAvailable(detail)
 
           # FIXME: Remove this when deprecations are removed
-          {releaseVersion, releaseNotes} = detail
-          detail = [releaseVersion, releaseNotes]
+          {releaseVersion} = detail
+          detail = [releaseVersion]
           if workspaceElement = atom.views.getView(atom.workspace)
             atom.commands.dispatch workspaceElement, "window:update-available", detail