API.md in row_boat-0.2.0 vs API.md in row_boat-0.3.0

@@ -15,10 +15,11 @@
 - [`preprocess_rows`](#preprocess_rows)
 - [`options`](#options)
 - [`handle_failed_row`](#handle_failed_row)
 - [`handle_failed_rows`](#handle_failed_rows)
 - [`value_converters`](#value_converters)
+- [`rollback_transaction?`](#rollback_transaction)
 
 ## Basic Usage
 
 Just subclass `RowBoat::Base` and define the [`import_into`](#import_into) and [`column_mapping`](#column_mapping) methods to get started (They're the only methods that you're required to implement).
 
@@ -359,8 +360,27 @@
 end
 
 module DescriptionConverter
   def self.convert(value)
     value.present? ? value : "default description :("
+  end
+end
+```
+
+## `rollback_transaction?`
+
+### Description
+
+Implement this method if you'd like to rollback the transaction after it otherwise has completed.
+
+Note: imports are only wrapped in a transaction if the `wrap_in_transaction` option is `true`. It defaults to `true` but this can be configured in [`options`](#options)
+
+### Example
+
+```ruby
+class ImportProduct < RowBoat::Base
+  # required configuration omitted for brevity
+  def rollback_transaction?
+    CsvService.already_imported?(csv_source)
   end
 end
 ```