diff --git a/data-explorer/kusto/query/external-table-function.md b/data-explorer/kusto/query/external-table-function.md
index b890f7b652..0d4ef8f71d 100644
--- a/data-explorer/kusto/query/external-table-function.md
+++ b/data-explorer/kusto/query/external-table-function.md
@@ -30,6 +30,8 @@ To accelerate queries over external delta tables, see [Query acceleration policy
 |--|--|--|--|
 | *TableName* | `string` |  :heavy_check_mark: | The name of the external table being queried. Must reference an external table of kind `blob`, `adl`, or `sql`.|
 | *MappingName* | `string` | | A name of a mapping object that maps fields in the external data shards to columns output.|
+| *MaxAgeOverride* | `TimeSpan` | | When [Query Acceleration Policy](../management/query-acceleration-policy.md) is enabled, override the policy's [MaxAge](../management/alter-query-acceleration-policy-command.md) property for this query. If you use this property, the external table returns accelerated data if the last index refresh time is greater than @now - MaxAgeOverride. Minimum: 1s|
+
 
 ## Authentication and authorization