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-rw-r--r--doc/filters.texi8
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
index 2f80f6e5a9..35a0e71160 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -14640,6 +14640,10 @@ linear
square root, default
@item cbrt
cubic root
+@item 4thrt
+4th root
+@item 5thrt
+5th root
@item log
logarithmic
@end table
@@ -14764,6 +14768,10 @@ linear
square root, default
@item cbrt
cubic root
+@item 4thrt
+4th root
+@item 5thrt
+5th root
@item log
logarithmic
@end table