CBFalconer said:
In this particular case it doesn't matter too much, but in general
on usenet you should realize that readers may very well not have
convenient access to previous articles in a thread. That means
that your reply articles should include adequate context, so that
they stand by themselves. Google is NOT usenet, it is only a very
poor interface to the real usenet system. To include proper
context when using google, see my sig. below. Please be sure to
read the referenced URLs.
It's not just people with proper newsreaders that get annoyed when
people don't give context. Even on Google, I find it hard to tell who a
poster is replying to when there is no context in a post (messages
often cross on Usenet, so it isn't necessarily the poster immediately
above them in the archives), and I don't want to have to go back to
read the start of a thread to find out what it's about (which isn't
always on the same Web page, or even the same NG). Although most of the
contextless posts on Usenet are due to Google users, that doesn't mean
that Google users can automatically tell who they're replying to.
(For instance, if I hadn't given context above, it would take me
several minutes using Google as a newsreader to determine that this
message was in reply to CBFalconer's, whereas I have seen newsreaders
which could do it in milliseconds.)