diff --git a/doc/filters.texi b/doc/filters.texi
index 004b859ea0..2bf197293f 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -17987,7 +17987,7 @@ Designation of angles:
 90 degrees clockwise
 @item 2
 180 degrees clockwise
-@item 4
+@item 3
 270 degrees clockwise
 @end table