diff --git a/sql-statements/sql-statement-admin-alter-ddl.md b/sql-statements/sql-statement-admin-alter-ddl.md
index b9bac02a928ec..16b8b236b9491 100644
--- a/sql-statements/sql-statement-admin-alter-ddl.md
+++ b/sql-statements/sql-statement-admin-alter-ddl.md
@@ -23,7 +23,7 @@ The following are the supported parameters for different DDL jobs and their corr
 - `ADD INDEX`:
     - `THREAD`: the concurrency of the DDL job. The initial value is set by `tidb_ddl_reorg_worker_cnt`.
     - `BATCH_SIZE`: the batch size. The initial value is set by [`tidb_ddl_reorg_batch_size`](/system-variables.md#tidb_ddl_reorg_batch_size).
-    - `MAX_WRITE_SPEED`: the maximum bandwidth limit for importing index records into each TiKV. The initial value is set by [`tidb_ddl_reorg_max_write_speed`](/system-variables.md#tidb_ddl_reorg_max_write_speed).
+    - `MAX_WRITE_SPEED`: the maximum bandwidth limit for importing index records into each TiKV. The initial value is set by [`tidb_ddl_reorg_max_write_speed`](/system-variables.md#tidb_ddl_reorg_max_write_speed-new-in-v850).
 
 - `MODIFY COLUMN`:
     - `THREAD`: the concurrency of the DDL job. The initial value is set by `tidb_ddl_reorg_worker_cnt`.