diff --git a/tiflash/tune-tiflash-performance.md b/tiflash/tune-tiflash-performance.md
index 6f6493f2ad5ac..4ed62b70d37c8 100644
--- a/tiflash/tune-tiflash-performance.md
+++ b/tiflash/tune-tiflash-performance.md
@@ -304,7 +304,7 @@ The [`tidb_max_tiflash_threads`](/system-variables.md#tidb_max_tiflash_threads-n
 set @@tidb_max_tiflash_threads = 20;
 ```
 
-The following example shows the query result before and after `tidb_max_tiflash_threads` is re-configured. Before the re-configuration, the execution concurrency of all TiFlash operators is 24. After the value of this variable changes to `20`, the concurrency becomes 60.
+The following example shows the query result before and after `tidb_max_tiflash_threads` is re-configured. Before `tidb_max_tiflash_threads` is set, the concurrency of request execution for a single TiFlash instance is 8 threads. Since the cluster has a total of 3 TiFlash instances, the total number of threads for request execution on all TiFlash instances is 24 (8 × 3). After `tidb_max_tiflash_threads` is set to `20`, the total number of threads for request execution on all TiFlash instances is 60 (20 × 3).
 
 Before `tidb_max_tiflash_threads` is re-configured: