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-rw-r--r--doc/src/sgml/cube.sgml5
1 files changed, 3 insertions, 2 deletions
diff --git a/doc/src/sgml/cube.sgml b/doc/src/sgml/cube.sgml
index 9cda8cac972..e010305d848 100644
--- a/doc/src/sgml/cube.sgml
+++ b/doc/src/sgml/cube.sgml
@@ -189,8 +189,9 @@
Get <replaceable>n</replaceable>-th coordinate of cube in following way:
n = 2 * k - 1 means lower bound of <replaceable>k</replaceable>-th
dimension, n = 2 * k means upper bound of
- <replaceable>k</replaceable>-th dimension. This operator is designed
- for KNN-GiST support.
+ <replaceable>k</replaceable>-th dimension. Negative
+ <replaceable>n</replaceable> denotes inversed value of corresponding
+ positive coordinate. This operator is designed for KNN-GiST support.
</entry>
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