Update description

Author: Lucky-Wang16

articles/data-factory/connector-snowflake.md

@@ -270,7 +270,7 @@ To copy data from Snowflake, the following properties are supported in the Copy
 | type | The type of export command, set to **SnowflakeExportCopyCommand**. | Yes |
 | storageIntegration | Specify the name of your storage integration that you created in the Snowflake. For the prerequisite steps of using the storage integration, see [Configuring a Snowflake storage integration](https://docs.snowflake.com/en/user-guide/data-load-azure-config#option-1-configuring-a-snowflake-storage-integration). | No |
 | additionalCopyOptions | Additional copy options, provided as a dictionary of key-value pairs. Examples: MAX_FILE_SIZE, OVERWRITE. For more information, see [Snowflake Copy Options](https://docs.snowflake.com/en/sql-reference/sql/copy-into-location.html#copy-options-copyoptions). | No |
-| additionalFormatOptions | Additional file format options that are provided to COPY command as a dictionary of key-value pairs. Examples: DATE_FORMAT, TIME_FORMAT, TIMESTAMP_FORMAT, NULL_IF. For more information, see [Snowflake Format Type Options](https://docs.snowflake.com/en/sql-reference/sql/copy-into-location.html#format-type-options-formattypeoptions). <br/>When you select NULL_IF, the NULL value in the data will be converted to a specified value. If the value is not specified, it uses the default `NULL`. Additionally, the empty string in the data will be converted to a blank field. | No |
+| additionalFormatOptions | Additional file format options that are provided to COPY command as a dictionary of key-value pairs. Examples: DATE_FORMAT, TIME_FORMAT, TIMESTAMP_FORMAT, NULL_IF. For more information, see [Snowflake Format Type Options](https://docs.snowflake.com/en/sql-reference/sql/copy-into-location.html#format-type-options-formattypeoptions). <br/>When you use NULL_IF, the NULL value in Snowflake is converted to the specified value (which needs to be single-quoted) when writing to the delimited text file in the staging storage. This specified value is treated as NULL when reading from the staging file to the sink storage. The default value is 'NULL'. | No |
 
 >[!Note]
 > Make sure you have permission to execute the following command and access the schema *INFORMATION_SCHEMA* and the table *COLUMNS*.