diff --git a/src/chrome/content/options.xul b/src/chrome/content/options.xul
index e643710..5c68e89 100644
--- a/src/chrome/content/options.xul
+++ b/src/chrome/content/options.xul
@@ -20,6 +20,7 @@
 			<preference id="tbchatnotificationPlaySound" name="extensions.tbchatnotification.playsound" type="bool" />
 			<preference id="tbchatnotificationSoundFile" name="extensions.tbchatnotification.soundfile" type="string" />
 			<preference id="tbchatnotificationFlashIcon" name="extensions.tbchatnotification.flashicon" type="bool" />
+			<preference id="tbchatnotificationMUCNotify" name="extensions.tbchatnotification.mucnotify" type="bool" />
 		</preferences>
 		<checkbox preference="tbchatnotificationShowBody" label="&showbody.label;" accesskey="&showbody.accesskey;" />
 		<checkbox preference="tbchatnotificationPlaySound" label="&playsound.label;" accesskey="&playsound.accesskey;" />
@@ -29,6 +30,7 @@
 			<button label="..." oncommand="tbchatnotification.options.getFile('SoundFile');" />
 		</hbox>
 		<checkbox preference="tbchatnotificationFlashIcon" label="&flashicon.label;" accesskey="&flashicon.accesskey;" />
+		<checkbox preference="tbchatnotificationMUCNotify" label="&mucnotify.label;" accesskey="&mucnotify.accesskey;" />
 	</prefpane>
 
 </prefwindow>
diff --git a/src/chrome/content/overlay.js b/src/chrome/content/overlay.js
index f9bacde..eebe551 100644
--- a/src/chrome/content/overlay.js
+++ b/src/chrome/content/overlay.js
@@ -10,13 +10,18 @@ var TbChatNotifier = {
 
 	prefs : null,
 	observer : null,
+	observerTopics : {
+		newDirectedIncomingMessage : 'new-directed-incoming-message',
+		newText : 'new-text'
+	},
 	audio : null,
 
 	options : {
 		showbody : false,
 		playsound : false,
 		soundfile : '',
-		flashicon : false
+		flashicon : false,
+		mucnotify : false
 	},
 
 	/**
@@ -29,6 +34,7 @@ var TbChatNotifier = {
 		  .getService(Ci.nsIPrefService)
 		  .getBranch('extensions.tbchatnotification.');
 		prefs.QueryInterface(Ci.nsIPrefBranch);
+		
 		var options = this.options;
 		options.observe = function(subject, topic, data) {
 			if (topic != 'nsPref:changed') {
@@ -48,14 +54,18 @@ var TbChatNotifier = {
 				case 'flashicon' :
 					this.flashicon = prefs.getBoolPref('flashicon');
 					break;
+				case 'mucnotify' :
+					this.mucnotify = prefs.getBoolPref('mucnotify');
+					break;
 			}
 		}
 		prefs.addObserver('', options, false);
-
+		
 		options.showbody = prefs.getBoolPref('showbody');
 		options.playsound = prefs.getBoolPref('playsound');
 		options.soundfile = prefs.getCharPref('soundfile');
 		options.flashicon = prefs.getBoolPref('flashicon');
+		options.mucnotify = prefs.getBoolPref('mucnotify');
 
 		// Audio
 		this.audio = new Audio();
@@ -64,29 +74,41 @@ var TbChatNotifier = {
 		Cu.import('resource://gre/modules/XPCOMUtils.jsm');
 		Cu.import('resource://gre/modules/Services.jsm');
 
-		var OBSERVER_TOPIC = 'new-directed-incoming-message';
+		var imServices = {};
+		Cu.import("resource:///modules/imServices.jsm", imServices);
+		imServices = imServices.Services;
+
+		var observerTopics = this.observerTopics;
 
 		var notifier = this;
 		var observer = this.observer = {
 			observe: function(subject, topic, data) {
-				if (topic == OBSERVER_TOPIC) {
+				if (subject.incoming && (((topic == observerTopics.newDirectedIncomingMessage) && !options.mucnotify) || ((topic == observerTopics.newText) && options.mucnotify))) {
 					notifier.play();
-					notifier.notify(subject.alias, subject.originalMessage);
+					notifier.notify(subject.alias, subject.originalMessage, imServices.conversations.getUIConversation(subject.conversation).title);
 				}
 			},
 
 			QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver, Ci.nsISupportsWeakReference])
 		};
 
-		Services.obs.addObserver(observer, OBSERVER_TOPIC, true);
+		for (var topic in observerTopics) {
+			Services.obs.addObserver(observer, observerTopics[topic], true);
+		}
 	},
 
 	/**
 	 * Unload chat notifier.
 	 */
 	unload : function() {
-		this.prefs.addObserver('', this.options);
-		Services.obs.removeObserver(this.observer, OBSERVER_TOPIC);
+		this.prefs.removeObserver('', this.options);
+
+		var observer = this.observer,
+			observerTopics = this.observerTopics;
+			
+		for (var topic in observerTopics) {
+			Services.obs.removeObserver(observer, observerTopics[topic]);
+		}
 	},
 
 	/**
@@ -106,8 +128,9 @@ var TbChatNotifier = {
 	 * Show non-modal alert message.
 	 * @param from string
 	 * @param message string
+	 * @param conversation string
 	 */
-	notify : function(from, message) {
+	notify : function(from, message, conversation) {
 		var options = this.options;
 
 		try {
@@ -148,7 +171,7 @@ var TbChatNotifier = {
 
 			Cc['@mozilla.org/alerts-service;1']
 				.getService(Ci.nsIAlertsService)
-				.showAlertNotification('chrome://TbChatNotification/skin/icon32.png', title, text, true, from, listener);
+				.showAlertNotification('chrome://TbChatNotification/skin/icon32.png', title, text, true, conversation, listener);
 
 			if (options.flashicon) {
 				window.getAttention();
diff --git a/src/chrome/locale/cs-CZ/options.dtd b/src/chrome/locale/cs-CZ/options.dtd
index c6f656a..5a4ed93 100644
--- a/src/chrome/locale/cs-CZ/options.dtd
+++ b/src/chrome/locale/cs-CZ/options.dtd
@@ -7,3 +7,5 @@
 <!ENTITY soundfile.label "Vlastní zvuk">
 <!ENTITY flashicon.label "Rozblikat ikonu Thunderbirdu">
 <!ENTITY flashicon.accesskey "B">
+<!ENTITY mucnotify.label "Zobrazovat upozornění z více-uživatelských chatů">
+<!ENTITY mucnotify.accesskey "V">
diff --git a/src/chrome/locale/en-EN/options.dtd b/src/chrome/locale/en-EN/options.dtd
index d1b231d..3a6ff70 100644
--- a/src/chrome/locale/en-EN/options.dtd
+++ b/src/chrome/locale/en-EN/options.dtd
@@ -7,3 +7,5 @@
 <!ENTITY soundfile.label "Custom sound">
 <!ENTITY flashicon.label "Flash Thunderbird icon">
 <!ENTITY flashicon.accesskey "F">
+<!ENTITY mucnotify.label "Show notifications from multi-user chats">
+<!ENTITY mucnotify.accesskey "M">
diff --git a/src/defaults/preferences/prefs.js b/src/defaults/preferences/prefs.js
index 712fe73..c4e5f13 100644
--- a/src/defaults/preferences/prefs.js
+++ b/src/defaults/preferences/prefs.js
@@ -3,3 +3,4 @@ pref('extensions.tbchatnotification.showbody', false);
 pref('extensions.tbchatnotification.playsound', false);
 pref('extensions.tbchatnotification.soundfile', '');
 pref('extensions.tbchatnotification.flashicon', false);
+pref('extensions.tbchatnotification.mucnotify', false);
diff --git a/src/install.rdf b/src/install.rdf
index 3f9f5ae..34e8f3b 100644
--- a/src/install.rdf
+++ b/src/install.rdf
@@ -6,7 +6,7 @@
 
 		<em:id>tbchatnotification@forrest79.net</em:id>
 		<em:type>2</em:type>
-		<em:version>1.0.1</em:version>
+		<em:version>1.1.0</em:version>
 		<em:name>Thunderbird Chat Notification</em:name>
 		<em:iconURL>chrome://TbChatNotification/skin/icon32.png</em:iconURL>
 		<em:optionsURL>chrome://TbChatNotification/content/options.xul</em:optionsURL>