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-rw-r--r--doc/src/sgml/ref/create_table.sgml3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml
index 26eca6731c2..a422edd2313 100644
--- a/doc/src/sgml/ref/create_table.sgml
+++ b/doc/src/sgml/ref/create_table.sgml
@@ -430,7 +430,8 @@ CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXI
<para>
Currently, <literal>CHECK</literal> expressions cannot contain
subqueries nor refer to variables other than columns of the
- current row.
+ current row. The system column <literal>tableoid</literal>
+ may be referenced, but not any other system column.
</para>
<para>