diff --git a/docs/en/12-taos-sql/22-meta.md b/docs/en/12-taos-sql/22-meta.md
index 2b4a7e52505df5780c6f4705736e990cb4c51313..2d7c517dcaadf5dbc3e033e3d16c012f36966a67 100644
--- a/docs/en/12-taos-sql/22-meta.md
+++ b/docs/en/12-taos-sql/22-meta.md
@@ -98,7 +98,7 @@ Provides information about user-created databases. Similar to SHOW DATABASES.
 | 21  |      cachesize       | INT              | Memory per vnode used for caching the newest data. It should be noted that `cachesize` is a TDengine keyword and needs to be escaped with ` when used as a column name.   |
 | 22  |      wal_level       | INT              | WAL level. It should be noted that `wal_level` is a TDengine keyword and needs to be escaped with ` when used as a column name.                                      |
 | 23  |   wal_fsync_period   | INT              | Interval at which WAL is written to disk. It should be noted that `wal_fsync_period` is a TDengine keyword and needs to be escaped with ` when used as a column name.   |
-| 24  | wal_retention_period | INT              | WAL retention period. It should be noted that `wal_retention_period` is a TDengine keyword and needs to be escaped with ` when used as a column name.                                    |
+| 24  | wal_retention_period | INT              | WAL retention period, in second. It should be noted that `wal_retention_period` is a TDengine keyword and needs to be escaped with ` when used as a column name.                                    |
 | 25  |  wal_retention_size  | INT              | Maximum WAL size. It should be noted that `wal_retention_size` is a TDengine keyword and needs to be escaped with ` when used as a column name.                                    |
 | 26  |   stt_trigger   | SMALLINT | The threshold for number of files to trigger file merging. It should be noted that `stt_trigger` is a TDengine keyword and needs to be escaped with ` when used as a column name.  |
 | 27  |   table_prefix   | SMALLINT | The prefix length in the table name that is ignored when distributing table to vnode based on table name. It should be noted that `table_prefix` is a TDengine keyword and needs to be escaped with ` when used as a column name.  |
diff --git a/docs/zh/12-taos-sql/22-meta.md b/docs/zh/12-taos-sql/22-meta.md
index 3ab0b684ce4fcb3ca476410a1569b4d7f48a3dd1..a5396d860762fbd68ca24c8bad4a71c808e63272 100644
--- a/docs/zh/12-taos-sql/22-meta.md
+++ b/docs/zh/12-taos-sql/22-meta.md
@@ -98,7 +98,7 @@ TDengine 内置了一个名为 `INFORMATION_SCHEMA` 的数据库，提供对数
 | 21  |      cachesize       | INT              | 表示每个 vnode 中用于缓存子表最近数据的内存大小。需要注意，`cachesize` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。  |
 | 22  |      wal_level       | INT              | WAL 级别。需要注意，`wal_level` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。                                         |
 | 23  |   wal_fsync_period   | INT              | 数据落盘周期。需要注意，`wal_fsync_period` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。                                     |
-| 24  | wal_retention_period | INT              | WAL 的保存时长。需要注意，`wal_retention_period` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。                                   |
+| 24  | wal_retention_period | INT              | WAL 的保存时长，单位为秒。需要注意，`wal_retention_period` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。                                   |
 | 25  |  wal_retention_size  | INT              | WAL 的保存上限。需要注意，`wal_retention_size` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。                                   |
 | 26  |   stt_trigger   | SMALLINT | 触发文件合并的落盘文件的个数。需要注意，`stt_trigger` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |
 | 27  |   table_prefix   | SMALLINT | 内部存储引擎根据表名分配存储该表数据的 VNODE 时要忽略的前缀的长度。需要注意，`table_prefix` 为 TDengine 关键字，作为列名使用时需要使用 ` 进行转义。 |