diff --git a/data-explorer/kusto/api/rest/request-properties.md b/data-explorer/kusto/api/rest/request-properties.md
index 3372c39d02..ee96812707 100644
--- a/data-explorer/kusto/api/rest/request-properties.md
+++ b/data-explorer/kusto/api/rest/request-properties.md
@@ -77,7 +77,7 @@ The following table overviews the supported request properties.
 | `request_readonly_hardline` |  `bool` | If set to `true`, then the request operates in a strict read-only mode. The request isn't able to write anything, and any noncompliant functionality, such as plugins, are disabled. This option can't be modified as part of a [set statement](../../query/set-statement.md).|
 | `request_remote_entities_disabled` | `bool` | If set to `true`, prevents the request from accessing remote databases and remote entities. |
 | `request_sandboxed_execution_disabled` | `bool` | If set to `true`, prevents the request from invoking code in the sandbox. |
-| `request_user` | `string` | Specifies the request user to be used in reporting. For example, [.show queries](../../management/show-queries-command.md). This option can't be modified as part of a [set statement](../../query/set-statement.md).|
+| `request_user` | `string` | A free-text, caller-supplied identifier of the user on whose behalf the request is being made. It is captured in service-side diagnostic traces for correlation only. It does **not** populate the `User` column of [.show queries](../../management/show-queries-command.md) (that column always reflects the authenticated principal), and it is redacted (shown as `******`) wherever client request properties are surfaced. To pass caller context that should be visible in `.show queries`, or that should be consumed by the request classification policy, use `request_description` instead. This option can't be modified as part of a [set statement](../../query/set-statement.md).|
 | `results_error_reporting_placement` | `string`   | Determines the placement of errors in the result set. Options are `in_data`, `end_of_table`, and `end_of_dataset`. |
 | `results_progressive_enabled` | `bool` | If set to `true`, enables the progressive query stream. This option can't be modified as part of a [set statement](../../query/set-statement.md).|
 | `results_v2_fragment_primary_tables` |  `bool` | Causes primary tables to be sent in multiple fragments, each containing a subset of the rows. This option can't be modified as part of a [set statement](../../query/set-statement.md). |