diff --git a/doc/src/sgml/ref/lock.sgml b/doc/src/sgml/ref/lock.sgml
index 26e424b63e..913afe76dd 100644
--- a/doc/src/sgml/ref/lock.sgml
+++ b/doc/src/sgml/ref/lock.sgml
@@ -51,9 +51,9 @@ LOCK [ TABLE ] [ ONLY ] name [ * ]
restrictive lock mode possible. LOCK TABLE
provides for cases when you might need more restrictive locking.
For example, suppose an application runs a transaction at the
- Read Committed isolation level and needs to ensure that data in a
- table remains stable for the duration of the transaction. To
- achieve this you could obtain SHARE> lock mode over the
+ READ COMMITTED> isolation level and needs to ensure that
+ data in a table remains stable for the duration of the transaction.
+ To achieve this you could obtain SHARE> lock mode over the
table before querying. This will prevent concurrent data changes
and ensure subsequent reads of the table see a stable view of
committed data, because SHARE> lock mode conflicts with