Merge pull request #20282 from Matteo-T/patch-18

Clarification around user_sid column

Author: PRMerger16

docs/relational-databases/system-tables/dbo-sysproxies-transact-sql.md

@@ -33,7 +33,7 @@ ms.author: chadam
 |**credential_id**|**int**|ID of the credential that the proxy account uses.|  
 |**enabled**|**tinyint**|Status of the proxy account:<br /><br /> **0** = Disabled. **1** = Enabled.|  
 |**description**|**nvarchar(512)**|Description that the user entered when the proxy account was created.|  
-|**user_sid**|**varbinary(85)**|Microsoft Windows *security_identifier* of the user or group associated with the proxy credential.|  
+|**user_sid**|**varbinary(85)**|Microsoft Windows *security_identifier* of the user or group associated with the proxy credential at the time the proxy is added. To ensure that you have the latest information (for example, after an `ALTER CREDENTIAL` command), run `sp_update_proxy` to refresh.|
 |**credential_date_created**|**datetime**|Date and time that the credential was created.|  
 
 ## Remarks