difference on: length!是否修改資料庫的結構內容?

發現有這樣的警訊:
column type - difference on: length
declared: array('description' => t('TODO: please describe this field!'), 'type' => 'varchar', 'length' => 16, 'not null' => FALSE)
actual: array('description' => t('TODO: please describe this field!'), 'type' => 'varchar', 'length' => '64', 'not null' => FALSE)
這樣子是不是需要修改資料庫varchar這個欄位的資料長度?還是如何處理?