Recently, Erik posted:

Jon Woellhaf wrote:

Neither of you specified the runway?

Good point. No, we didn't. Standard practice around
here is to announce on entry to the pattern. After that,
everyone is using the same runway so it's never too big
of a deal.

Good practice, though, I'll make note.

It really is a good idea, especially at fields with more than one runway
and no established pattern. People can come and go from any direction.
Keep your eyes open, communicate clearly, and it's not a problem. I'm off
to do some practice at just such a field in a couple of hours.

Neil