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diff --git a/DOCS/man/en/vf.rst b/DOCS/man/en/vf.rst
index 13d782c0f4..439701754a 100644
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+++ b/DOCS/man/en/vf.rst
@@ -661,11 +661,19 @@ screenshot
screenshot_force
Same as ``screenshot``, but prefer it over VO based screenshot code.
-sub
+sub=[=bottom-margin:top-margin]
Moves subtitle rendering to an arbitrary point in the filter
chain, or force subtitle rendering in the video filter as opposed to using
video output OSD support.
+
+ <bottom-margin>
+ Adds a black band at the bottom of the frame. The SSA/ASS renderer can
+ place subtitles there (with ``--ass-use-margins``).
+ <top-margin>
+ Black band on the top for toptitles (with ``--ass-use-margins``).
+
+
*EXAMPLE*:
``--vf=sub,eq``