diff --git a/index.xhtml b/index.xhtml
index f75e881..136a019 100644
--- a/index.xhtml
+++ b/index.xhtml
@@ -21,6 +21,9 @@
 	<p>
 		Although the <strong>Frames Protocol</strong> <em>could</em> be used outside of <strong>Farcaster</strong>, at the time of writing, <strong>Farcaster</strong> clients are the only major (client-side) platform to support it.
 	</p>
+	<p>
+		(The server-side of the <strong>Frames Protocol</strong>, which is called a <strong>Frame Server</strong>, is an HTTP resource — which some might loosely call an HTTP (or HTTP) URL.)
+	</p>
 
 	<section>
 		<h2>Farcaster</h2>