Use of doxygen's \link command

I have an external HTML file I'd like to have linked form either my doxygen "Related Pages" tab or the left hand frame. It seems I need to use the \link command but I can't find a good example of how to use it or where. I am currently using doxywizard to generate the HTML.

So, is \link something I incorporate into my doxygen config file or do I add it when I build the HTML somehow?

Update

So I ended up having to do the following:

1. Create a new page (docs_main.html) that had the following:

   /*! \mainpage MY TITLE HERE
    * \section intro_sec External resources
    * My external page
    */
   

2. Include that page in my doxygen included files list

3. Rebuild my documentation

That added to my doxygen "Main Page" the following

MY TITLE HERE

My external page (which was a link to that page)