diff --git a/lib/io.js b/lib/io.js
index <HASH>..<HASH> 100644
--- a/lib/io.js
+++ b/lib/io.js
@@ -52,6 +52,7 @@ function RajaServer(opts) {
 			io.to('*').to(msg.url).emit('message', msg);
 		});
 		socket.on('join', function(msg) {
+			if (msg.mtime) socket.joinArgs = msg.mtime;
 			socket.join(msg.room, function(err) {
 				if (err) console.error(err)
 			});
Will pass some option mtime to backlog adapter