Proxmox 4.0 - How to update a template ?

Hi all,

I would like to know how to update a template ?

I created a container from a generic template dowloaded via the Web Interface of Proxmox. I updated this container and now i want to "transform" it as a new template for deploying my futur new containers. How can i do it ?

Thank you for your help.

ps: sorry for my poor english.