README.md in embulk-output-redshift-0.4.2 vs README.md in embulk-output-redshift-0.4.3

@@ -33,26 +33,22 @@
   - **timezone**: If input column type (embulk type) is timestamp, this plugin needs to format the timestamp value into a SQL string. In this cases, this timezone option is used to control the timezone. (string, value of default_timezone option is used by default)
 
 ### Modes
 
 * **insert**:
-  * Behavior: This mode writes rows to some intermediate tables first. If all those tasks run correctly, runs `INSERT INTO <target_table> SELECT * FROM <intermediate_table_1> UNION ALL SELECT * FROM <intermediate_table_2> UNION ALL ...` query.
+  * Behavior: This mode writes rows to some intermediate tables first. If all those tasks run correctly, runs `INSERT INTO <target_table> SELECT * FROM <intermediate_table_1> UNION ALL SELECT * FROM <intermediate_table_2> UNION ALL ...` query. If the target table doesn't exist, it is created automatically.
   * Transactional: Yes. This mode successfully writes all rows, or fails with writing zero rows.
   * Resumable: Yes.
 * **insert_direct**:
-  * Behavior: This mode inserts rows to the target table directly.
+  * Behavior: This mode inserts rows to the target table directly. If the target table doesn't exist, it is created automatically.
   * Transactional: No. If fails, the target table could have some rows inserted.
   * Resumable: No.
 * **truncate_insert**:
   * Behavior: Same with `insert` mode excepting that it truncates the target table right before the last `INSERT ...` query.
   * Transactional: Yes.
   * Resumable: Yes.
-* **merge**:
-  * Behavior: This mode writes rows to some intermediate tables first. If all those tasks run correctly, runs `with updated AS (UPDATE .... RETURNING ...) INSERT INTO ....` query.
-  * Transactional: Yes.
-  * Resumable: Yes.
 * **replace**:
-  * Behavior: Same with `insert` mode excepting that it truncates the target table right before the last `INSERT ...` query.
+  * Behavior: This mode writes rows to an intermediate table first. If all those tasks run correctly, drops the target table and alters the name of the intermediate table into the target table name.
   * Transactional: Yes.
   * Resumable: No.
 
 ### Example