diff --git a/lualib/multicast.lua b/lualib/multicast.lua
index d303976a..ea2617d4 100644
--- a/lualib/multicast.lua
+++ b/lualib/multicast.lua
@@ -20,6 +20,12 @@ function multicast.newchannel(conf)
 	return channel
 end
 
+function multicast.bind(channel, conf)
+	assert(multicastd, "Init first")
+	assert(not dispatch[channel])
+	dispatch[channel] = default_conf(conf)
+end
+
 function multicast.publish(channel, ...)
 	local conf = assert(dispatch[channel])
 	skynet.call(multicastd, "lua", "PUB", channel, c.pack(conf.pack(...)))
diff --git a/test/testmulticast.lua b/test/testmulticast.lua
index 55914016..127da25f 100644
--- a/test/testmulticast.lua
+++ b/test/testmulticast.lua
@@ -10,7 +10,7 @@ skynet.start(function()
 		assert(cmd == "init")
 		mc.subscribe(channel, {
 			dispatch = function (channel, source, ...)
-				print(string.format("%s ===> %s (%d)",skynet.address(source), skynet.address(skynet.self()), channel), ...)
+				print(string.format("%s <=== %s (%d)",skynet.address(skynet.self()),skynet.address(source), channel), ...)
 			end
 		})
 	end)
@@ -26,6 +26,7 @@ skynet.start(function()
 		skynet.send(sub, "lua", "init", channel)
 	end
 
+	print(skynet.address(skynet.self()), "===>", channel)
 	mc.publish(channel, "Hello World")
 end)