Auto_discovery_link_tag in a partial?

I have a partial that has a link_to(image_tag()) for an RSS feed. I
would like this feed to be auto discoverable (link tag in document
head).

The problem is that it is too late to stick something in the head of the
document by the time I am rendering this partial.

The auto_discovery_link_tag must be in the head of the doc.

Any suggestions ?

– thanks, Andrew