diff --git a/README.md b/README.md
index ccbe48e..bcdb648 100644
--- a/README.md
+++ b/README.md
@@ -44,9 +44,11 @@ composer require 'quorum/exporter'
 function __construct($engine)
 ```
 
+DataExport is the object used to orchestrate the export process regardless of export format.
+
 ##### Parameters:
 
-- ***\Quorum\Exporter\EngineInterface*** `$engine`
+- ***\Quorum\Exporter\EngineInterface*** `$engine` - The engine by which to export the data sheets.
 
 ---
 
@@ -61,7 +63,7 @@ Add a Data Sheet to the export.
 ##### Parameters:
 
 - ***\Quorum\Exporter\DataSheet*** `$sheet` - The DataSheet to add to the export
-- ***null*** | ***string*** `$sheetTitle` - Optional Title to give the data export.
+- ***string*** | ***null*** `$sheetTitle` - Optional Title to give the data export.
 Most Engines will interpret this as filename (sans file extension).
 If excluded, the name will be left to the engine.
 
@@ -82,9 +84,18 @@ NULL will open a php://output resource.
 
 ### Class: \Quorum\Exporter\DataSheet
 
+#### Method: DataSheet->__construct
 
+```php
+function __construct([ $name = null])
+```
 
-#### Undocumented Method: `DataSheet->__construct([ $name = null])`
+DataSheet is the representation of a Worksheet
+
+##### Parameters:
+
+- ***string*** | ***null*** `$name` - The name to give the sheet. The use is Engine implementation specific but is likely
+    filename or Sheet name
 
 ---
 
@@ -96,31 +107,35 @@ function getName()
 
 ##### Returns:
 
-- ***string***
+- ***string*** | ***null***
 
 ---
 
-#### Method: DataSheet->addRows
+#### Method: DataSheet->addRow
 
 ```php
-function addRows($dataSet)
+function addRow($row)
 ```
 
+Append a row worth of data to the end of the Worksheet.
+
 ##### Parameters:
 
-- ***array*** | ***\Iterator*** `$dataSet`
+- ***array*** `$row` - An array of scalars. Otherwise an InvalidDataTypeException will be thrown.
 
 ---
 
-#### Method: DataSheet->addRow
+#### Method: DataSheet->addRows
 
 ```php
-function addRow($row)
+function addRows($dataSet)
 ```
 
+Append multiple rows of data to the end of the Worksheet.
+
 ##### Parameters:
 
-- ***array*** `$row`
+- ***array*** | ***\Iterator*** `$dataSet` - An iterable of arrays of scalars.
 
 ---
 
@@ -172,7 +187,7 @@ Checks if current position is valid
 
 ##### Returns:
 
-- ***boolean***
+- ***bool***
 
 ---
 
@@ -331,6 +346,8 @@ function getEnclosure()
 function disableBom([ $disable = true])
 ```
 
+Whether to disable the leading Byte Order Mark for the given encoding from being output.
+
 ##### Parameters:
 
 - ***bool*** `$disable`
diff --git a/src/DataExport.php b/src/DataExport.php
index 60274ea..cd38c3b 100644
--- a/src/DataExport.php
+++ b/src/DataExport.php
@@ -17,7 +17,9 @@ class DataExport {
 	protected $engine;
 
 	/**
-	 * @param EngineInterface $engine
+	 * DataExport is the object used to orchestrate the export process regardless of export format.
+	 *
+	 * @param \Quorum\Exporter\EngineInterface $engine The engine by which to export the data sheets.
 	 */
 	public function __construct( EngineInterface $engine ) {
 		$this->engine = $engine;
@@ -27,7 +29,7 @@ public function __construct( EngineInterface $engine ) {
 	 * Add a Data Sheet to the export.
 	 *
 	 * @param DataSheet   $sheet The DataSheet to add to the export
-	 * @param null|string $sheetTitle Optional Title to give the data export.
+	 * @param string|null $sheetTitle Optional Title to give the data export.
 	 * Most Engines will interpret this as filename (sans file extension).
 	 * If excluded, the name will be left to the engine.
 	 */
diff --git a/src/DataSheet.php b/src/DataSheet.php
index 249a54a..5b3ce43 100644
--- a/src/DataSheet.php
+++ b/src/DataSheet.php
@@ -28,29 +28,29 @@ class DataSheet implements \Iterator {
 	 */
 	protected $currentValue = null;
 
+	/**
+	 * DataSheet is the representation of a Worksheet
+	 *
+	 * @param string|null $name The name to give the sheet. The use is Engine implementation specific but is likely
+	 *     filename or Sheet name
+	 */
 	public function __construct( $name = null ) {
 		$this->name      = $name;
 		$this->tmpStream = fopen("php://temp", "r+");
 	}
 
 	/**
-	 * @return string
+	 * @return string|null
 	 */
 	public function getName() {
 		return $this->name;
 	}
 
 	/**
-	 * @param array|\Iterator $dataSet
-	 */
-	public function addRows( $dataSet ) {
-		foreach( $dataSet as $row ) {
-			$this->addRow($row);
-		}
-	}
-
-	/**
-	 * @param array $row
+	 * Append a row worth of data to the end of the Worksheet.
+	 *
+	 * @param array $row An array of scalars. Otherwise an InvalidDataTypeException will be thrown.
+	 * @throws InvalidDataTypeException
 	 */
 	public function addRow( array $row ) {
 		foreach( $row as &$col ) {
@@ -64,6 +64,17 @@ public function addRow( array $row ) {
 		fwrite($this->tmpStream, json_encode($row) . "\n");
 	}
 
+	/**
+	 * Append multiple rows of data to the end of the Worksheet.
+	 *
+	 * @param array|\Iterator $dataSet An iterable of arrays of scalars.
+	 */
+	public function addRows( $dataSet ) {
+		foreach( $dataSet as $row ) {
+			$this->addRow($row);
+		}
+	}
+
 	/**
 	 * Return the current value
 	 *
@@ -100,7 +111,7 @@ public function key() {
 	/**
 	 * Checks if current position is valid
 	 *
-	 * @return boolean
+	 * @return bool
 	 */
 	public function valid() {
 		return $this->currentValue !== null;
diff --git a/src/EngineInterface.php b/src/EngineInterface.php
index 3ff6402..f8f6566 100644
--- a/src/EngineInterface.php
+++ b/src/EngineInterface.php
@@ -6,13 +6,14 @@ interface EngineInterface {
 
 	/**
 	 * @param \Quorum\Exporter\DataSheet $sheet
-	 * @return mixed
+	 * @return void
 	 * @access private
 	 */
 	public function processSheet( DataSheet $sheet );
 
 	/**
 	 * @param resource $outputStream
+	 * @return void
 	 * @access private
 	 */
 	public function outputToStream( $outputStream );
diff --git a/src/Engines/CsvEngine.php b/src/Engines/CsvEngine.php
index bb79b1e..acd3f6d 100644
--- a/src/Engines/CsvEngine.php
+++ b/src/Engines/CsvEngine.php
@@ -280,6 +280,8 @@ final protected function isLittleEndian() {
 	}
 
 	/**
+	 * Whether to disable the leading Byte Order Mark for the given encoding from being output.
+	 *
 	 * @param bool $disable
 	 */
 	public function disableBom( $disable = true ) {