diff --git a/config_example.json b/config_example.json
index 395bfd8..6516899 100644
--- a/config_example.json
+++ b/config_example.json
@@ -67,8 +67,10 @@
     "audio/mpeg": "mpg",
     "audio/mp3": "mp3",
     "audio/ogg": "ogg",
+    "audio/opus": "opus",
     "audio/flac": "flac",
     "audio/x-flac": "flac",
-    "video/x-m4v": "mp4"
+    "video/x-m4v": "mp4",
+    "video/x-matroska": "mkv"
   }
 }