diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index e3f833d231..60ac5ef658 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -1617,7 +1617,10 @@ repeat('Pg', 4) PgPgPgPg
double precision
- Rounds to nearest integer
+ Rounds to nearest integer. For numeric, ties are
+ broken by rounding away from zero. For double precision,
+ the tie-breaking behavior is platform dependent, but
+ round to nearest even
is the most common rule.
round(42.4)
@@ -1632,7 +1635,7 @@ repeat('Pg', 4) PgPgPgPg
Rounds v to s decimal
- places
+ places. Ties are broken by rounding away from zero.
round(42.4382, 2)