diff --git a/dashboard/dashboard-slow-query.md b/dashboard/dashboard-slow-query.md
index 24f419d7c8fd3..a16ce278c08ed 100644
--- a/dashboard/dashboard-slow-query.md
+++ b/dashboard/dashboard-slow-query.md
@@ -62,7 +62,8 @@ Click any item in the list to display detailed execution information of the slow
 
 > **Note:**
 >
-> The maximum length of the query recorded in the `Query` column is limited by the [`tidb_stmt_summary_max_sql_length`](/system-variables.md#tidb_stmt_summary_max_sql_length-new-in-v40) system variable.
+> - The maximum length of the query recorded in the `Query` column is limited by the [`tidb_stmt_summary_max_sql_length`](/system-variables.md#tidb_stmt_summary_max_sql_length-new-in-v40) system variable.
+> - For prepared statements, arguments are listed at the end of the query, for example: `[arguments: "foo", 123]`. Non-printable arguments are displayed as hex literals, for example, `0x01`.
 
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