API.md in row_boat-0.1.0 vs API.md in row_boat-0.2.0

@@ -153,17 +153,17 @@
 
 ## `column_mapping`
 
 ### Description
 
-It is required that you override this method with a hash that maps columns in your CSV to their preferred names.
+It is required that you override this method with either a hash that maps columns in your CSV to their preferred names or an array of your preferred column names.
 
-By default
+By default when using a hash
 - CSV column names are downcased symbols of what they look like in the CSV.
 - CSV columns that are not mapped are ignored when processing the CSV.
 
-If you're familiar with [SmarterCSV](https://github.com/tilo/smarter_csv#documentation), this method essentially defines your `:key_mapping` and with the `:remove_unmapped_keys` setting set to `true`.
+If you're familiar with [SmarterCSV](https://github.com/tilo/smarter_csv#documentation), this method essentially defines your `:key_mapping` with the `:remove_unmapped_keys` setting set to `true` when provided with a hash. When given an array it is the `:user_provided_headers` option.
 
 You can change these defaults by overriding the [`options`](#options) method.
 
 ### Example
 
@@ -175,28 +175,39 @@
       prdct_nm: :name,
       "price/cost_amnt": :price_in_cents
     }
   end
 end
+
+# or...
+
+class ImportProduct < RowBoat::Base
+  # other required configuration omitted for brevity
+  def column_mapping
+    [:name, :price_in_cents]
+  end
+end
 ```
 
 ## `preprocess_row`
 
 ### Description
 
 Implement this method if you need to do some work on the row before the record is inserted/updated.
 
 If you return `nil` from this method, the row will be skipped in the import.
 
+You also have access to `row_number` here.
+
 If the work you intend to do with the row only requires changing one attribute, it is recommended that you override [`value_converters`](#value_converters) instead of this.
 
 ### Example
 
 ```ruby
   class ImportProduct < RowBoat::Base
     # required configuration omitted for brevity
     def preprocess_row(row)
-      { default: :value }.merge(row)
+      { position: row_number }.merge(row)
     end
     # or...
     def preprocess_row(row)
       if row[:name] && row[:price]
         row