diff --git a/statistics.md b/statistics.md
index d2516fbf38719..aba956eacf9e2 100644
--- a/statistics.md
+++ b/statistics.md
@@ -6,7 +6,7 @@ aliases: ['/docs/dev/statistics/','/docs/dev/reference/performance/statistics/']
 
 # Introduction to Statistics
 
-TiDB uses statistics to decide [which index to choose](/choose-index.md). The `tidb_analyze_version` variable controls the statistics collected by TiDB. Currently, two versions of statistics are supported: `tidb_analyze_version = 1` and `tidb_analyze_version = 2`. In versions before v5.1, the default value of this variable is `1`. In v5.1, the default value of this variable is `2`, which serves as an experimental feature. These two versions include different information in TiDB:
+TiDB uses statistics to decide [which index to choose](/choose-index.md). The `tidb_analyze_version` variable controls the statistics collected by TiDB. Currently, two versions of statistics are supported: `tidb_analyze_version = 1` and `tidb_analyze_version = 2`. In versions before v5.1.0, the default value of this variable is `1`. In v5.1.0, the default value of this variable is `2`, which serves as an experimental feature. These two versions include different information in TiDB:
 
 | Information | Version 1 | Version 2|
 | --- | --- | ---|
diff --git a/system-variables.md b/system-variables.md
index eabede51b3cbf..36226e03e6af3 100644
--- a/system-variables.md
+++ b/system-variables.md
@@ -218,6 +218,14 @@ MPP is a distributed computing framework provided by the TiFlash engine, which a
 - Default value: `OFF`
 - This variable is used to set whether the `AUTO_INCREMENT` property of a column is allowed to be removed by executing `ALTER TABLE MODIFY` or `ALTER TABLE CHANGE` statements. It is not allowed by default.
 
+### tidb_analyze_version <span class="version-mark">New in v5.1.0</span>
+
+- Scope: SESSION | GLOBAL
+- Value options: `1` and `2`
+- Default value: `2`
+- Controls how TiDB collects statistics.
+- In versions before v5.1.0, the default value of this variable is `1`. In v5.1.0, the default value of this variable is `2`, which serves as an experimental feature. For detailed introduction, see [Introduction to Statistics](/statistics.md).
+
 ### tidb_auto_analyze_end_time
 
 - Scope: GLOBAL