diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index f69b04db05..ef25cf1e96 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -5985,6 +5985,7 @@ local0.* /var/log/postgresql
logs all statements for all transactions.
log_transaction_sample_rate is helpful to track a
sample of transaction.
+ Only superusers can change this setting.