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-rw-r--r--doc/src/sgml/ref/pgbench.sgml2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/src/sgml/ref/pgbench.sgml b/doc/src/sgml/ref/pgbench.sgml
index 03e1212d50a..f5db8d18d32 100644
--- a/doc/src/sgml/ref/pgbench.sgml
+++ b/doc/src/sgml/ref/pgbench.sgml
@@ -771,6 +771,8 @@ pgbench <optional> <replaceable>options</> </optional> <replaceable>dbname</>
<para>
There is a simple variable-substitution facility for script files.
+ Variable names must consist of letters (including non-Latin letters),
+ digits, and underscores.
Variables can be set by the command-line <option>-D</> option,
explained above, or by the meta commands explained below.
In addition to any variables preset by <option>-D</> command-line options,