diff --git a/statistics.md b/statistics.md
index 7c52ed64ded9b..7d21e2e2cd172 100644
--- a/statistics.md
+++ b/statistics.md
@@ -412,7 +412,7 @@ When you run the `ANALYZE` statement, you can adjust the concurrency using the f
 
 #### `tidb_build_stats_concurrency`
 
-Currently, when you run the `ANALYZE` statement, the task is divided into multiple small tasks. Each task only works on one column or index. You can use the `tidb_build_stats_concurrency` parameter to control the number of simultaneous tasks. The default value is `4`.
+This variable controls the concurrency for building statistics during manual `ANALYZE`, such as the number of table or partition analysis tasks that can be processed simultaneously. The default value is `4`.
 
 #### `tidb_distsql_scan_concurrency`
 
diff --git a/system-variables.md b/system-variables.md
index 417777b17a3ee..ceca067245411 100644
--- a/system-variables.md
+++ b/system-variables.md
@@ -744,7 +744,7 @@ MPP is a distributed computing framework provided by the TiFlash engine, which a
 - Scope: SESSION | GLOBAL
 - Persists to cluster: Yes
 - Default value: `1`
-- This variable specifies the concurrency of reading and writing statistics for a partitioned table when TiDB analyzes the partitioned table.
+- For manual and auto `ANALYZE`, this variable controls the concurrency for saving `ANALYZE` results, including writing TopN and histograms to system tables.
 
 ### tidb_analyze_version <span class="version-mark">New in v5.1.0</span>
 
@@ -805,7 +805,7 @@ MPP is a distributed computing framework provided by the TiFlash engine, which a
 - Type: Integer
 - Default value: `1`
 - Range: `[1, 256]`
-- This variable is used to set the concurrency of executing the automatic update of statistics.
+- This variable controls the concurrency for building statistics during auto `ANALYZE`, such as the number of table or partition analysis tasks that can be processed simultaneously.
 
 ### tidb_backoff_lock_fast
 
@@ -899,8 +899,7 @@ MPP is a distributed computing framework provided by the TiFlash engine, which a
 - Default value: `4`
 - Range: `[1, 256]`
 - Unit: Threads
-- This variable is used to set the concurrency of executing the `ANALYZE` statement.
-- When the variable is set to a larger value, the execution performance of other queries is affected.
+- This variable controls the concurrency for building statistics during manual `ANALYZE`, such as the number of table or partition analysis tasks that can be processed simultaneously.
 
 ### tidb_capture_plan_baselines <span class="version-mark">New in v4.0</span>
 
@@ -2749,7 +2748,7 @@ For a system upgraded to v5.0 from an earlier version, if you have not modified
 - Scope: SESSION | GLOBAL
 - Persists to cluster: Yes
 - Default value: `1`
-- This variable specifies the concurrency of merging statistics for a partitioned table when TiDB analyzes the partitioned table.
+- This variable controls the concurrency for merging TopN results of partitioned tables.
 
 ### tidb_metric_query_range_duration <span class="version-mark">New in v4.0</span>