diff --git a/fbchat/models.py b/fbchat/models.py
index d085d5d..ad90ea2 100644
--- a/fbchat/models.py
+++ b/fbchat/models.py
@@ -270,17 +270,20 @@ class FileAttachment(Attachment):
 class AudioAttachment(Attachment):
     #: Name of the file
     filename = None
-    #: playable_url
+    #: Url of the audio file
     url = None
     #: Duration of the audioclip in milliseconds
     duration = None
+    #: Audio type
+    audio_type = None
 
-    def __init__(self, filename=None, url=None, duration=None, **kwargs):
+    def __init__(self, filename=None, url=None, duration=None, audio_type=None, **kwargs):
         """Represents an audio file that has been sent as a Facebook attachment"""
         super(AudioAttachment, self).__init__(**kwargs)
         self.filename = filename
         self.url = url
         self.duration = duration
+        self.audio_type = audio_type
 
 class ImageAttachment(Attachment):
     #: The extension of the original image (eg. 'png')