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-rw-r--r--doc/src/sgml/pgbench.sgml5
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/src/sgml/pgbench.sgml b/doc/src/sgml/pgbench.sgml
index 58686b1a8b5..9ed8b76963c 100644
--- a/doc/src/sgml/pgbench.sgml
+++ b/doc/src/sgml/pgbench.sgml
@@ -185,6 +185,11 @@ pgbench <optional> <replaceable>options</> </optional> <replaceable>dbname</>
Multiply the number of rows generated by the scale factor.
For example, <literal>-s 100</> will create 10,000,000 rows
in the <structname>pgbench_accounts</> table. Default is 1.
+ When the scale is 20,000 or larger, the columns used to
+ hold account identifiers (<structfield>aid</structfield> columns)
+ will switch to using larger integers (<type>bigint</type>),
+ in order to be big enough to hold the range of account
+ identifiers.
</para>
</listitem>
</varlistentry>