docs: expand on discovery

fixes #18. thanks again @swentel!

static/index.html

@@ -50,6 +50,7 @@ and the rest of the <a href="https://en.wikipedia.org/wiki/Fediverse">fediverse<
 <li><a href="#sites">Which sites are supported?</a></li>
 <li><a href="#setup">How do I set it up?</a></li>
 <li><a href="#use">How do I use it?</a></li>
+<li><a href="#discovery">How can people on the fediverse find me?</a></li>
 <li><a href="#troubleshooting">I tried it, and it didn't work!</a></li>
 <li><a href="#cost">How much does it cost?</a></li>
 <li><a href="#who">Who are you? Why did you make this?</a></li>
@@ -205,6 +206,14 @@ The webmention source URL will usually be a proxy page on <code>fed.brid.gy</cod
 </p>
 </li>
 
+<li id="discovery" class="question">How can people on the fediverse find me?</li>
+<li class="answer">
+<p>In general, all you have to do is use Bridgy Fed to interact with the fediverse once. Send an original post from your site, like or repost something, follow someone, etc. Then, when other users search for <code>@yourdomain.com@yourdomain.com</code>, they should find your profile!
+</p>
+<p>In practice, this can be a bit finicky, and takes time to propagate to other instances besides the one you first interacted with, but it generally does work.
+</p>
+</li>
+
 <li id="troubleshooting" class="question">I tried it, and it didn't work!</li>
 <li class="answer">
 <p>If you sent a webmention, check the HTTP response code and body. It will usually describe the error.</p>