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-rw-r--r--doc/filters.texi12
1 files changed, 10 insertions, 2 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
index 8404f4fb9a..50ef692077 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1421,8 +1421,16 @@ S-plane zeros/poles
@end table
@item process, r
-Set kind of processing.
-Can be @code{d} - direct or @code{s} - serial cascading. Default is @code{s}.
+Set type of processing.
+
+@table @samp
+@item d
+direct processing
+@item s
+serial processing
+@item p
+parallel processing
+@end table
@item precision, e
Set filtering precision.