Update description for analyze version (#7890) (#8193)

pingcap · Apr 13, 2022 · 3fb5511 · 3fb5511
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diff --git a/statistics.md b/statistics.md
@@ -5,7 +5,7 @@ summary: Learn how the statistics collect table-level and column-level informati
 
 # 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 v5.1.0, the default value of this variable is `1`. In v5.1, v5.2, and v5.3, the default value of this variable is `2`, which serves as an experimental feature.
+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 v5.3.0 and later versions, the default value of this variable is `2`, which serves as an experimental feature. If your cluster is upgraded from a version earlier than v5.3.0 to v5.3.0 or later, the default value of `tidb_analyze_version` does not change.
 
 > **Note:**
 >

diff --git a/system-variables.md b/system-variables.md
@@ -451,7 +451,7 @@ MPP is a distributed computing framework provided by the TiFlash engine, which a
 - Default value: `2`
 - Range: `[1, 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).
+- In v5.3.0 and later versions, the default value of this variable is `2`, which serves as an experimental feature. If your cluster is upgraded from a version earlier than v5.3.0 to v5.3.0 or later, the default value of `tidb_analyze_version` does not change. For detailed introduction, see [Introduction to Statistics](/statistics.md).
 
 ### tidb_auto_analyze_end_time