This is a good example of something that should be a self answered question.
If you have a question, especially a relatively obscure one, then it's a great idea to go ahead and ask it, and then answer it yourself if you've found the answer already. This increases the knowledge base of this site, and helps other folks find the answer easily if they've got the same question.
Just be sure you put some work into the question itself. My biggest knock on this kind of thing is that people will often half ass the question so they can post the answer. Both should be of quality.
Your other option is waiting for a relatively obscure question to show up and then you answer it. Isn't it better for that person to find the answer waiting for them already?