From: erik  
@@ -166,6 +168,12 @@
  *      });
  * 
  * 
+ *  
+ *   Note that in addition to this method it is also possible to directly control transactions
+ *   through {@link JpaBuilder#begin()}, {@link JpaBuilder#commit(javax.persistence.EntityManager)}, 
+ *   and {@link JpaBuilder#rollback(javax.persistence.EntityManager)}. 
+ * UserTransaction
+ *   JPA testing combined with JDBC and DBUnit
  * 
@@ -197,7 +205,18 @@
  * is in fact a so-called contextual reference.
  * Next, the proxy is obtained from the factory. Invoking any method on it will make sure a new 
  * transaction is started and a new entity manager is created for the scope of that transaction.
- * 
UserTransaction
+ * It is also possible to manage JPA transaction through a UserTransaction. 
+ * This is mostly useful if you are test software that uses UserTransaction for 
+ * managing transactions, or if you want to manage multiple transactional resources. 
+ * See the explanation at {@link org.wamblee.test.transactions.SimpleTransactionManager} for more details. 
+ *