Mention cube root.

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 6cc162bb7a85fe7f7c7b0f5a8e24fb4e1c353ae7..67b8adaafb10fdf7a188486044bd48b985ef184e 100644 (file)
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -141,6 +141,12 @@
    square root
    sqrt(2.0)
        
+       
+   cbrt(float8)
+   float8
+   cube root
+   cbrt(27.0)
+       
        
    trunc(float8)
    float8