diff --git a/functions-and-operators/tidb-functions.md b/functions-and-operators/tidb-functions.md
index ceeb249db4009..87fd3e6b50273 100644
--- a/functions-and-operators/tidb-functions.md
+++ b/functions-and-operators/tidb-functions.md
@@ -17,7 +17,7 @@ The following functions are TiDB extensions, and are not present in MySQL:
 | [`TIDB_DECODE_BINARY_PLAN()`](#tidb_decode_binary_plan) | Decodes binary plans. |
 | [`TIDB_DECODE_KEY()`](#tidb_decode_key) | Decodes a TiDB-encoded key entry into a JSON structure containing `_tidb_rowid` and `table_id`. These encoded keys can be found in some system tables and logging outputs. |
 | [`TIDB_DECODE_PLAN()`](#tidb_decode_plan) | Decodes a TiDB execution plan. |
-| [`TIDB_DECODE_SQL_DIGESTS()`](#tidb_decode_sql_digests) | Queries the normalized SQL statements (a form without formats and arguments) corresponding to a set of SQL digests in the cluster. |
+| [`TIDB_DECODE_SQL_DIGESTS()`](#tidb_decode_sql_digests) | Queries the normalized SQL statements (in which literal values are replaced with placeholders such as `?` or `...`) corresponding to a set of SQL digests in the cluster. |
 | [`TIDB_ENCODE_INDEX_KEY()`](#tidb_encode_index_key) | Encodes an index key. |
 | [`TIDB_ENCODE_RECORD_KEY()`](#tidb_encode_record_key) | Encodes a record key. |
 | [`TIDB_ENCODE_SQL_DIGEST()`](#tidb_encode_sql_digest) | Gets a digest for a query string. |
@@ -42,7 +42,7 @@ The following functions are TiDB extensions, and are not present in MySQL:
 | [`TIDB_DECODE_BINARY_PLAN()`](#tidb_decode_binary_plan) | Decodes binary plans. |
 | [`TIDB_DECODE_KEY()`](#tidb_decode_key) | Decodes a TiDB-encoded key entry into a JSON structure containing `_tidb_rowid` and `table_id`. These encoded keys can be found in some system tables and logging outputs. |
 | [`TIDB_DECODE_PLAN()`](#tidb_decode_plan) | Decodes a TiDB execution plan. |
-| [`TIDB_DECODE_SQL_DIGESTS()`](#tidb_decode_sql_digests) | Queries the normalized SQL statements (a form without formats and arguments) corresponding to a set of SQL digests in the cluster. |
+| [`TIDB_DECODE_SQL_DIGESTS()`](#tidb_decode_sql_digests) | Queries the normalized SQL statements (in which literal values are replaced with placeholders such as `?` or `...`) corresponding to a set of SQL digests in the cluster. |
 | [`TIDB_ENCODE_INDEX_KEY()`](#tidb_encode_index_key) | Encodes an index key. |
 | [`TIDB_ENCODE_RECORD_KEY()`](#tidb_encode_record_key) | Encodes a record key. |
 | [`TIDB_ENCODE_SQL_DIGEST()`](#tidb_encode_sql_digest) | Gets a digest for a query string. |
@@ -294,7 +294,7 @@ SELECT tidb_decode_plan('8QIYMAkzMV83CQEH8E85LjA0CWRhdGE6U2VsZWN0aW9uXzYJOTYwCXR
 
 ## TIDB_DECODE_SQL_DIGESTS
 
-The `TIDB_DECODE_SQL_DIGESTS()` function is used to query the normalized SQL statements (a form without formats and arguments) corresponding to the set of SQL digests in the cluster. This function accepts 1 or 2 arguments:
+The `TIDB_DECODE_SQL_DIGESTS()` function is used to query the normalized SQL statements (in which literal values are replaced with placeholders such as `?` or `...`) corresponding to the set of SQL digests in the cluster. This function accepts 1 or 2 arguments:
 
 * `digests`: A string. This parameter is in the format of a JSON string array, and each string in the array is a SQL digest.
 * `stmtTruncateLength`: An integer (optional). It is used to limit the length of each SQL statement in the returned result. If a SQL statement exceeds the specified length, the statement is truncated. `0` means that the length is unlimited.
diff --git a/releases/release-5.2.0.md b/releases/release-5.2.0.md
index 4dd3e6f5fef4b..cfe3024823338 100644
--- a/releases/release-5.2.0.md
+++ b/releases/release-5.2.0.md
@@ -112,7 +112,7 @@ In v5.2, the key new features and improvements are as follows:
     In v5.2, the following enhancements are made to Lock View:
 
     - In addition to the SQL digest column in the Lock View-related tables, add a column to these tables that shows the corresponding normalized SQL text. You do not have to manually query the statement corresponding to a SQL digest.
-    - Add the `TIDB_DECODE_SQL_DIGESTS` function to query the normalized SQL statements (a form without formats and arguments) corresponding to a set of SQL digests in the cluster. This simplifies the operation of querying the statements that have been historically executed by a transaction.
+    - Add the `TIDB_DECODE_SQL_DIGESTS` function to query the normalized SQL statements (in which literal values are replaced with placeholders such as `?` or `...`) corresponding to a set of SQL digests in the cluster. This simplifies the operation of querying the statements that have been historically executed by a transaction.
     - Add a column in the `DATA_LOCK_WAITS` and `DEADLOCKS` system tables to show the table name, row ID, index value, and other key information interpreted from a key. This simplifies the operations such as locating the table to which a key belongs and interpreting the key information.
     - Support collecting the information of retryable deadlock errors in the `DEADLOCKS` table, which makes it easier to troubleshoot issues caused by such errors. The error collection is disabled by default and can be enabled using the `pessimistic-txn.deadlock-history-collect-retryable` configuration.
     - Support distinguishing query-executing transactions from idle transactions on the `TIDB_TRX` system table. The `Normal` state is now divided into `Running` and `Idle` states.