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diff --git a/DOCS/man/en/af.rst b/DOCS/man/en/af.rst
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@@ -550,3 +550,13 @@ scaletempo[=option1:option2:...]
Would playback audio file at 1.2x normal speed, with audio at normal
pitch. Changing playback speed, would change pitch, leaving audio
tempo at 1.2x.
+
+lavfi=graph
+ Filter audio using ffmpeg's libavfilter.
+
+ <graph>
+ Libavfilter graph. See ``lavfi`` video filter for details - the graph
+ syntax is the same.
+
+ Warning: due to shortcomings in the current ``-af`` option parser code,
+ the filter graph must not contain any ``,``.