diff --git a/xmpp_muc.go b/xmpp_muc.go
new file mode 100644
index 0000000..0c56620
--- /dev/null
+++ b/xmpp_muc.go
@@ -0,0 +1,31 @@
+// Copyright 2013 Flo Lauber <dev@qatfy.at>.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// TODO(flo):
+//   - support password protected MUC rooms
+//   - cleanup signatures of join/leave functions
+package xmpp
+
+import (
+	"fmt"
+)
+
+const (
+	nsMUC     = "http://jabber.org/protocol/muc"
+	nsMUCUser = "http://jabber.org/protocol/muc#user"
+)
+
+// xep-0045 7.2
+func (c *Client) JoinMUC(jid string) {
+	fmt.Fprintf(c.tls, "<presence to='%s'>\n"+
+		"<x xmlns='%s' />\n"+
+		"</presence>",
+		xmlEscape(jid), nsMUC)
+}
+
+// xep-0045 7.14
+func (c *Client) LeaveMUC(jid string) {
+	fmt.Fprintf(c.tls, "<presence from='%s' to='%s' type='unavailable' />",
+		c.jid, xmlEscape(jid))
+}