diff --git a/youtube_dl_gui/optionsframe.py b/youtube_dl_gui/optionsframe.py
index 774d88f..f360c17 100644
--- a/youtube_dl_gui/optionsframe.py
+++ b/youtube_dl_gui/optionsframe.py
@@ -765,7 +765,7 @@ class AudioTab(TabPanel):
 
     """
     AUDIO_QUALITY = twodict([("0", _("high")), ("5", _("mid")), ("9", _("low"))])
-    AUDIO_FORMATS = ["mp3", "wav", "aac", "m4a", "vorbis"]
+    AUDIO_FORMATS = ["mp3", "wav", "aac", "m4a", "vorbis", "opus"]
 
     TO_AUDIO_LABEL = _("Convert to Audio")
     KEEP_VIDEO_LABEL = _("Keep Video")
diff --git a/youtube_dl_gui/optionsmanager.py b/youtube_dl_gui/optionsmanager.py
index a2d97c1..ca18db3 100644
--- a/youtube_dl_gui/optionsmanager.py
+++ b/youtube_dl_gui/optionsmanager.py
@@ -76,7 +76,7 @@ class OptionsManager(object):
                 after post processing it.
 
             audio_format (string): Audio format of the post processed file.
-                Available values are "mp3", "wav", "aac", "m4a", "vorbis".
+                Available values are "mp3", "wav", "aac", "m4a", "vorbis", "opus".
 
             audio_quality (string): Audio quality of the post processed file.
                 Available values are "9", "5", "0". The lowest the value the
@@ -285,7 +285,7 @@ class OptionsManager(object):
             '264', '138', '242', '243', '244', '247', '248', '271', '272', '82',
             '83', '84', '85', '100', '101', '102', '139', '140', '141', '171', '172')
 
-        VALID_AUDIO_FORMAT = ('mp3', 'wav', 'aac', 'm4a', 'vorbis')
+        VALID_AUDIO_FORMAT = ('mp3', 'wav', 'aac', 'm4a', 'vorbis', 'opus')
 
         VALID_AUDIO_QUALITY = ('0', '5', '9')