Clarify last_valid_restore_time

Author: dimitri-furman

docs/relational-databases/system-tables/backupset-transact-sql.md

@@ -4,7 +4,7 @@ description: "Contains a row for each backup set. A backup set contains the back
 author: VanMSFT
 ms.author: vanto
 ms.reviewer: randolphwest
-ms.date: 09/09/2022
+ms.date: 02/29/2024
 ms.service: sql
 ms.subservice: system-objects
 ms.topic: "reference"
@@ -92,7 +92,7 @@ monikerRange: ">=aps-pdw-2016||>=sql-server-2016||>=sql-server-linux-2017||=azur
 |**key_algorithm**|**nvarchar(32)**|The encryption algorithm used to encrypt the backup. NO_Encryption value indicated that the backup was not encrypted.|
 |**encryptor_thumbprint**|**varbinary(20)**|The thumbprint of the encryptor which can be used to find certificate or the asymmetric key in the database. In the case where the backup was not encrypted, this value is NULL.|
 |**encryptor_type**|**nvarchar(32)**|The type of encryptor used: Certificate or Asymmetric Key. In the case where the backup was not encrypted, this value is NULL.|
-|**last_valid_restore_time**|**datetime**|The latest point in time to which the backup can be restored. Introduced in [!INCLUDE[sssql22-md](../../includes/sssql22-md.md)]. |
+|**last_valid_restore_time**|**datetime**|The timestamp of the last transaction log record included in the transaction log backup, for log records that carry a timestamp. Assists in constructing restore plans by helping you find the last log backup to restore when the `STOPAT` clause is specified in the `RESTORE LOG` statement. That log backup has the **last_valid_restore_time** strictly greater than the time specified in the `STOPAT` clause. Introduced in [!INCLUDE[sssql22-md](../../includes/sssql22-md.md)]. |
 |**compression_algorithm**|**nvarchar(32)**|The compression algorithm that was used when creating the SQL Server backup. Introduced in [!INCLUDE[sssql22-md](../../includes/sssql22-md.md)]. Default is `MS_XPRESS`. For more information, see [BACKUP COMPRESSION](../../t-sql/statements/backup-transact-sql.md#compression) and [Integrated acceleration and offloading](../integrated-acceleration/overview.md).|
 
 ## Remarks