diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 20e642468fb..a76783849a0 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -1,5 +1,5 @@
@@ -5563,10 +5563,10 @@ SELECT TIMESTAMP 'now';
area(box '((0,0),(1,1))')
- box(box>, box>)
+ box_intersect(box>, box>)
box
intersection box
- box(box '((0,0),(1,1))',box '((0.5,0.5),(2,2))')
+ box_intersect(box '((0,0),(1,1))',box '((0.5,0.5),(2,2))')
center(object>)