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-rw-r--r--doc/filters.texi12
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diff --git a/doc/filters.texi b/doc/filters.texi
index 15d9d0fd8d..da8d12604a 100644
--- a/doc/filters.texi
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@@ -25969,6 +25969,18 @@ replace old rows with new ones.
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@end table
Default is @code{replace}.
+
+@item hmode
+Set histogram mode.
+
+It accepts the following values:
+@table @samp
+@item abs
+Use absolute values of samples.
+@item sign
+Use untouched values of samples.
+@end table
+Default is @code{abs}.
@end table
@section aphasemeter