diff --git a/docs/en/12-taos-sql/10-function.md b/docs/en/12-taos-sql/10-function.md
index 6b62950eccecb5414a4c71af9ca1e183c22d23ab..d46e01da419f245df279fb1712b2f0743461c3b9 100644
--- a/docs/en/12-taos-sql/10-function.md
+++ b/docs/en/12-taos-sql/10-function.md
@@ -1054,11 +1054,11 @@ TOP(expr, k)
 UNIQUE(expr)
 ```
 
-**Description**: The values that occur the first time in the specified column. The effect is similar to `distinct` keyword, but it can also be used to match tags or timestamp. The first occurrence of a timestamp or tag is used.
+**Description**: The values that occur the first time in the specified column. The effect is similar to `distinct` keyword, but it can also be used to match tags or timestamp which correspond to first occurrence of the record.
 
 **Return value type**:Same as the data type of the column being operated upon
 
-**Applicable column types**: Any data types except for timestamp
+**Applicable column types**: Any data types
 
 **Applicable table types**: table, STable
 
diff --git a/docs/zh/12-taos-sql/10-function.md b/docs/zh/12-taos-sql/10-function.md
index b4785dc5e648cc86e1e520be79ff7c0ec9ccbd8f..e9ab75c135c0a69c9adab7c606a68b4528e30357 100644
--- a/docs/zh/12-taos-sql/10-function.md
+++ b/docs/zh/12-taos-sql/10-function.md
@@ -1046,11 +1046,11 @@ TOP(expr, k)
 UNIQUE(expr)
 ```
 
-**功能说明**：返回该列的数值首次出现的值。该函数功能与 distinct 相似，但是可以匹配标签和时间戳信息。可以针对除时间列以外的字段进行查询，可以匹配标签和时间戳，其中的标签和时间戳是第一次出现时刻的标签和时间戳。
+**功能说明**：返回该列数据首次出现的值。该函数功能与 distinct 相似，可以匹配标签和时间戳，对应数据第一次出现时刻的标签和时间戳。
 
 **返回数据类型**：同应用的字段。
 
-**适用数据类型**：适合于除时间类型以外的字段。
+**适用数据类型**：全部类型字段。
 
 **适用于**: 表和超级表。