All patches in Fedora spec files SHOULD have a comment above them about their upstream status. Any time you create a patch, it is best practice to file it in an upstream bug tracker, and include a link to that in the comment above the patch. For example:
# http://bugzilla.gnome.org/show_bug.cgi?id=12345 Patch0: gnome-panel-fix-frobnicator.patch
The above is perfectly acceptable; but if you prefer, a brief comment about what the patch does above can be helpful:
# Don't crash with frobnicator applet # http://bugzilla.gnome.org/show_bug.cgi?id=12345 Patch0: gnome-panel-fix-frobnicator.patch
Sending patches upstream and adding this comment will help ensure that Fedora is acting as a good FLOSS citizen (see Staying close to upstream projects). It will help others (and even you) down the line in package maintenance by knowing what patches are likely to appear in a new upstream release.
You can indicate that you have sent the patch upstream and any known status:
# Sent upstream via email 20080407 Patch0: foobar-fix-the-bar.patch
# Upstream has applied this in SVN trunk Patch0: foobar-fix-the-baz.patch