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diff --git a/doc/filters.texi b/doc/filters.texi
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@@ -4294,6 +4294,10 @@ components that are supposed to be identical, such as neutral whites, grays,
or blacks.
@end table
Default is @code{parade}.
+
+@item levels_mode
+Set mode for @code{levels}. Can be either @code{linear}, or @code{logarithmic}.
+Default is @code{linear}.
@end table
@subsection Examples
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