Galaxy Nexus 4.1.2 update

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http://androidforums.com – Hi everybody.... I have an unlocked Galaxy Nexus which is rooted to Team Win Recovery Project v2.1.2 and upgraded to jellybean 4.1.1. Recently i got a notification that says system update is available. when i open the notification it says "update downloaded and verified" and at the bottom it says "reboot and install". I select reboot and install. It reboots, goes into the recovery mode and then stays on that page. It does not install or do anything. I do not know where to look for the file so that i can update it manually. i am new to this rooting and all so i am very conf (General)