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-rw-r--r--doc/filters.texi4
1 files changed, 2 insertions, 2 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
index 618eb28e28..bd93e0ab84 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1090,9 +1090,9 @@ Set coefficients format.
transfer function
@item zp
Z-plane zeros/poles, cartesian (default)
-@item zpr
+@item pr
Z-plane zeros/poles, polar radians
-@item zpd
+@item pd
Z-plane zeros/poles, polar degrees
@end table