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1 files changed, 5 insertions, 1 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
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+++ b/doc/filters.texi
@@ -8259,13 +8259,17 @@ The filter accepts the following options:
@table @option
@item sigma
-Set sigma, standard deviation of Gaussian blur. Default is @code{0.5}.
+Set horizontal sigma, standard deviation of Gaussian blur. Default is @code{0.5}.
@item steps
Set number of steps for Gaussian approximation. Defauls is @code{1}.
@item planes
Set which planes to filter. By default all planes are filtered.
+
+@item sigmaV
+Set vertical sigma, if negative it will be same as @code{sigma}.
+Default is @code{-1}.
@end table
@section geq
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