diff --git a/addons/mail/models/mail_message.py b/addons/mail/models/mail_message.py
index 6bd83f6427c..3ec357c8610 100644
--- a/addons/mail/models/mail_message.py
+++ b/addons/mail/models/mail_message.py
@@ -549,14 +549,15 @@ class Message(models.Model):
         message_tree = dict((m.id, m) for m in self)
         self._message_read_dict_postprocess(message_values, message_tree)
 
-        # add is_note flag
-        internal_subtype_ids = self.env['mail.message.subtype'].search([('internal', '=', True)]).ids
+        # add subtype data (is_note flag, subtype_description)
+        subtypes = self.env['mail.message.subtype'].search(
+            [('id', 'in', [msg['subtype_id'][0] for msg in message_values if msg['subtype_id']])]).read(['internal', 'description'])
+        subtypes_dict = dict((subtype['id'], subtype) for subtype in subtypes)
         for message in message_values:
-            if message['subtype_id'] and message['subtype_id'][0]:
-                message['is_note'] = bool(message['subtype_id'][0] in internal_subtype_ids)
+            message['is_note'] = message['subtype_id'] and subtypes_dict[message['subtype_id'][0]]['internal']
+            message['subtype_description'] = message['subtype_id'] and subtypes_dict[message['subtype_id'][0]]['description']
         return message_values
 
-
     #------------------------------------------------------
     # mail_message internals
     #------------------------------------------------------
diff --git a/addons/mail/static/src/js/chat_manager.js b/addons/mail/static/src/js/chat_manager.js
index 6da02410141..56c9e6405d7 100644
--- a/addons/mail/static/src/js/chat_manager.js
+++ b/addons/mail/static/src/js/chat_manager.js
@@ -72,6 +72,7 @@ function make_message (data) {
         body: data.body || "",
         date: data.date,
         message_type: data.message_type,
+        subtype_description: data.subtype_description,
         is_note: data.is_note,
         attachment_ids: data.attachment_ids,
         subject: data.subject,
diff --git a/addons/mail/static/src/xml/thread.xml b/addons/mail/static/src/xml/thread.xml
index b2b5fa088f1..62f692a9901 100644
--- a/addons/mail/static/src/xml/thread.xml
+++ b/addons/mail/static/src/xml/thread.xml
@@ -102,6 +102,9 @@
                     </span>
                 </p>
                 <t t-if="message.tracking_value_ids &amp;&amp; message.tracking_value_ids.length &gt; 0">
+                    <t t-if="message.subtype_description">
+                        <p t-esc="message.subtype_description"/>
+                    </t>
                     <t t-call="mail.ChatThread.MessageTracking"/>
                 </t>
                 <p t-if="message.subject" class="o_mail_subject">Subject: <t t-esc="message.subject"/></p>