update readme

README.md

@@ -290,6 +290,8 @@ One can also utilise [DynamoDB Transaction](https://docs.aws.amazon.com/amazondy
 
 #### Write transaction
 
+DynamoDB enables you to do multiple `Put`, `Update` and `Delete` in a single `WriteTransaction` command. One can also provide an optional `ClientRequestToken` to the transaction to ensure idempotency.
+
 ```ts
 const trx = tsynamoClient.createWriteTransaction();
 
@@ -319,6 +321,9 @@ await trx.execute();
 > [!IMPORTANT]
 > When passing the items into the transaction using the tsynamoClient, do not execute the individual calls! Instead just pass in the query builder as the item.
 
+> [!WARNING]  
+> DynamoDB also supports doing `ConditionCheck` operations in the transaction, but Tsynamo does not yet support those.
+
 #### Read transaction
 
 Since the read transaction output can affect multiple tables, the resulting output is an array of tuples where the first item is the name of the table and the second item is the item itself (or `undefined` if the item was not found). This can be used as a discriminated union to determine the resulting item's type.