diff --git a/Docs/manual.texi b/Docs/manual.texi
index eb132f27267cf0c871d8c0f1eb6c3ca81dcad4af..4e67d7aaeb253d23bb352d76d31aefc81d484798 100644
--- a/Docs/manual.texi
+++ b/Docs/manual.texi
@@ -35972,7 +35972,7 @@ tables.
 
 @example
 SET [GLOBAL | SESSION] TRANSACTION ISOLATION LEVEL
-[READ UNCOMMITTED | READ COMMITTED | REPEATABLE READ | SERIALIZABLE]
+@{ READ UNCOMMITTED | READ COMMITTED | REPEATABLE READ | SERIALIZABLE @}
 @end example
 
 Sets the transaction isolation level for the global, whole session or