momo-jun commented on code in PR #15200:
URL: https://github.com/apache/pulsar/pull/15200#discussion_r852952661
##########
site2/docs/txn-use.md:
##########
@@ -20,21 +20,29 @@ This section provides an example of how to use the
transaction API to send and r
2. Enable transaction.
- Change the configuration in the `broker.conf` file.
+ Change the configuration in the `broker.conf` or `standalone.conf` file.
```
+ //mandatory configuration, used to enable transaction coordinator
transactionCoordinatorEnabled=true
+
+ //mandtory configuration, used to create systemTopic used for transaction
buffer snapshot
systemTopicEnabled=true
+
```
- If you want to enable batch messages in transactions, follow the steps
below.
+ * If you want to enable batch messages in transactions, follow the steps
below.
Set `acknowledgmentAtBatchIndexLevelEnabled` to `true` in the
`broker.conf` or `standalone.conf` file.
```
acknowledgmentAtBatchIndexLevelEnabled=true
```
+ * [message deduplication](cookbooks-deduplication.md) is a mandatory
configuration, if need to guarantee exactly-once semantics.
Review Comment:
```suggestion
* If you want to guarantee exactly-once semantics, you need to enable
[message deduplication](cookbooks-deduplication.md).
```
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