diff --git a/msg_chat_state.go b/msg_chat_state.go
new file mode 100644
index 0000000..72fca52
--- /dev/null
+++ b/msg_chat_state.go
@@ -0,0 +1,43 @@
+package xmpp // import "gosrc.io/xmpp"
+
+import "encoding/xml"
+
+/*
+Support for:
+- XEP-0085 - Chat State Notifications: https://xmpp.org/extensions/xep-0085.html
+*/
+
+const NSMsgChatStateNotifications = "http://jabber.org/protocol/chatstates"
+
+type StateActive struct {
+	MsgExtension
+	XMLName xml.Name `xml:"http://jabber.org/protocol/chatstates active"`
+}
+
+type StateComposing struct {
+	MsgExtension
+	XMLName xml.Name `xml:"http://jabber.org/protocol/chatstates composing"`
+}
+
+type StateGone struct {
+	MsgExtension
+	XMLName xml.Name `xml:"http://jabber.org/protocol/chatstates gone"`
+}
+
+type StateInactive struct {
+	MsgExtension
+	XMLName xml.Name `xml:"http://jabber.org/protocol/chatstates inactive"`
+}
+
+type StatePaused struct {
+	MsgExtension
+	XMLName xml.Name `xml:"http://jabber.org/protocol/chatstates paused"`
+}
+
+func init() {
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatStateNotifications, "active"}, StateActive{})
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatStateNotifications, "composing"}, StateComposing{})
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatStateNotifications, "gone"}, StateGone{})
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatStateNotifications, "inactive"}, StateInactive{})
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatStateNotifications, "paused"}, StatePaused{})
+}