Update concepts-query-store.md

Author: nachoalonsoportillo

articles/postgresql/flexible-server/concepts-query-store.md

@@ -4,7 +4,7 @@ description: This article describes the Query Store feature in Azure Database fo
 author: varun-dhawan
 ms.author: varundhawan
 ms.reviewer: maghan
-ms.date: 05/14/2024
+ms.date: 07/25/2024
 ms.service: postgresql
 ms.subservice: flexible-server
 ms.topic: conceptual
@@ -81,7 +81,8 @@ Here are some examples of how you can gain more insights into your workload usin
 
 ## Configuration options
 
-When Query Store is enabled, it saves data in aggregation windows of length determined by the `pg_qs.interval_length_minutes` server parameter (defaults to 15 minutes). For each window, it stores the 500 distinct queries per window.
+When Query Store is enabled, it saves data in aggregation windows of length determined by the `pg_qs.interval_length_minutes` server parameter (defaults to 15 minutes). For each window, it stores up to 500 distinct (with distinct userid, dbid, and queryid) queries per window. If during an interval the number of distinct queries reaches 500, the 5% with lower usage are deallocated to make room for more.
+
 The following options are available for configuring Query Store parameters:
 
 | **Parameter** | **Description** | **Default** | **Range** |