diff --git a/ffmpeg/_filters.py b/ffmpeg/_filters.py
index 8bbe0cd..d220b69 100644
--- a/ffmpeg/_filters.py
+++ b/ffmpeg/_filters.py
@@ -421,6 +421,7 @@ __all__ = [
     'drawbox',
     'drawtext',
     'filter_',
+    'filter_multi_output',
     'hflip',
     'hue',
     'overlay',