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diff --git a/doc/filters.texi b/doc/filters.texi
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@@ -1925,6 +1925,13 @@ luminance value greater than the minimum allowed value.
The parameters describing the bounding box are printed on the filter
log.
+The filter accepts the following option:
+
+@table @option
+@item min_val
+Set the minimal luminance value. Default is @code{16}.
+@end table
+
@section blackdetect
Detect video intervals that are (almost) completely black. Can be