Having to restart Rails server on changes

Hi all,
I’m just starting into some Ruby on Rails for a new website my friends and I are doing. All is working nicely so far except for one small, yet annoying thing. Each time I upload a change to an .rhtml file, I have to restart the Webrick (rails) application server in order to see those changes. It always sees changes to any other type of files (controllers/models etc…) just not rhtml.

Does anyone have a reason for this happening, and maybe even something I can do to prevent having to restart?