diff --git a/system/database/DB_utility.php b/system/database/DB_utility.php
index 3bd77c8..31102c0 100644
--- a/system/database/DB_utility.php
+++ b/system/database/DB_utility.php
@@ -45,23 +45,30 @@
 	// --------------------------------------------------------------------
 
 	/**
+	 * List databases statement
+	 *
+	 * @var	string
+	 */
+	$_list_databases		= FALSE;
+
+	/**
 	 * OPTIMIZE TABLE statement
 	 *
-	 * @var	string|bool
+	 * @var	string
 	 */
 	protected $_optimize_table	= FALSE;
 
 	/**
 	 * REPAIR TABLE statement
 	 *
-	 * @var	string|bool
+	 * @var	string
 	 */
 	protected $_repair_table	= FALSE;
 
 	// --------------------------------------------------------------------
 
 	/**
-	 * Constructor
+	 * Class constructor
 	 *
 	 * @return	void
 	 */
diff --git a/system/database/drivers/cubrid/cubrid_forge.php b/system/database/drivers/cubrid/cubrid_forge.php
index a7b4efd..33d5021 100644
--- a/system/database/drivers/cubrid/cubrid_forge.php
+++ b/system/database/drivers/cubrid/cubrid_forge.php
@@ -35,13 +35,26 @@
  */
 class CI_DB_cubrid_forge extends CI_DB_forge {
 
+	/**
+	 * CREATE DATABASE statement
+	 *
+	 * @var	string
+	 */
 	protected $_create_database	= FALSE;
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * DROP DATABASE statement
+	 *
+	 * @var	string
+	 */
 	protected $_drop_database	= FALSE;
 
 	/**
 	 * Process Fields
 	 *
-	 * @param	mixed	the fields
+	 * @param	mixed	$fields
 	 * @return	string
 	 */
 	protected function _process_fields($fields)
diff --git a/system/database/drivers/ibase/ibase_forge.php b/system/database/drivers/ibase/ibase_forge.php
index 7f3693d..7c4d00a 100644
--- a/system/database/drivers/ibase/ibase_forge.php
+++ b/system/database/drivers/ibase/ibase_forge.php
@@ -35,12 +35,19 @@
  */
 class CI_DB_ibase_forge extends CI_DB_forge {
 
+	/**
+	 * DROP TABLE statement
+	 *
+	 * @var	string
+	 */
 	protected $_drop_table	= 'DROP TABLE %s';
 
+	// --------------------------------------------------------------------
+
 	/**
 	 * Create database
 	 *
-	 * @param	string	the database name
+	 * @param	string	$db_name
 	 * @return	string
 	 */
 	public function create_database($db_name)
diff --git a/system/database/drivers/ibase/ibase_utility.php b/system/database/drivers/ibase/ibase_utility.php
index 06de677..5eb209a 100644
--- a/system/database/drivers/ibase/ibase_utility.php
+++ b/system/database/drivers/ibase/ibase_utility.php
@@ -35,10 +35,8 @@
  */
 class CI_DB_ibase_utility extends CI_DB_utility {
 
-	protected $_list_databases	= FALSE;
-
 	/**
-	 * Interbase/Firebird Export
+	 * Export
 	 *
 	 * @param	string	$filename
 	 * @return	mixed
diff --git a/system/database/drivers/mssql/mssql_forge.php b/system/database/drivers/mssql/mssql_forge.php
index e0b26d8..1eef648 100644
--- a/system/database/drivers/mssql/mssql_forge.php
+++ b/system/database/drivers/mssql/mssql_forge.php
@@ -35,8 +35,15 @@
  */
 class CI_DB_mssql_forge extends CI_DB_forge {
 
+	/**
+	 * DROP TABLE statement
+	 *
+	 * @var	string
+	 */
 	protected $_drop_table	= 'DROP TABLE %s';
 
+	// --------------------------------------------------------------------
+
 	/**
 	 * Create Table
 	 *
diff --git a/system/database/drivers/mssql/mssql_utility.php b/system/database/drivers/mssql/mssql_utility.php
index 90cc23b..a011d59 100644
--- a/system/database/drivers/mssql/mssql_utility.php
+++ b/system/database/drivers/mssql/mssql_utility.php
@@ -35,13 +35,24 @@
  */
 class CI_DB_mssql_utility extends CI_DB_utility {
 
+	/**
+	 * List databases statement
+	 *
+	 * @var	string
+	 */
 	protected $_list_databases	= 'EXEC sp_helpdb'; // Can also be: EXEC sp_databases
+
+	/**
+	 * OPTIMIZE TABLE statement
+	 *
+	 * @var	string
+	 */
 	protected $_optimize_table	= 'ALTER INDEX all ON %s REORGANIZE';
 
 	/**
-	 * MSSQL Export
+	 * Export
 	 *
-	 * @param	array	Preferences
+	 * @param	array	$params	Preferences
 	 * @return	bool
 	 */
 	protected function _backup($params = array())
diff --git a/system/database/drivers/mysql/mysql_forge.php b/system/database/drivers/mysql/mysql_forge.php
index 05db862..7ce4e8b 100644
--- a/system/database/drivers/mysql/mysql_forge.php
+++ b/system/database/drivers/mysql/mysql_forge.php
@@ -35,12 +35,19 @@
  */
 class CI_DB_mysql_forge extends CI_DB_forge {
 
+	/**
+	 * CREATE DATABASE statement
+	 *
+	 * @var	string
+	 */
 	protected $_create_database	= 'CREATE DATABASE %s CHARACTER SET %s COLLATE %s';
 
+	// --------------------------------------------------------------------
+
 	/**
 	 * Process Fields
 	 *
-	 * @param	mixed	the fields
+	 * @param	mixed	$fields
 	 * @return	string
 	 */
 	protected function _process_fields($fields)
diff --git a/system/database/drivers/mysql/mysql_utility.php b/system/database/drivers/mysql/mysql_utility.php
index bc20d25..8aa0517 100644
--- a/system/database/drivers/mysql/mysql_utility.php
+++ b/system/database/drivers/mysql/mysql_utility.php
@@ -35,14 +35,33 @@
  */
 class CI_DB_mysql_utility extends CI_DB_utility {
 
+	/**
+	 * List databases statement
+	 *
+	 * @var	string
+	 */
 	protected $_list_databases	= 'SHOW DATABASES';
-	protected $_optimize_table	= 'OPTIMIZE TABLE %s';
-	protected $_repair_table	= 'REPAIR TABLE %s';
 
 	/**
-	 * MySQL Export
+	 * OPTIMIZE TABLE statement
 	 *
-	 * @param	array	Preferences
+	 * @var	string
+	 */
+	protected $_optimize_table	= 'OPTIMIZE TABLE %s';
+
+	/**
+	 * REPAIR TABLE statement
+	 *
+	 * @var	string
+	 */
+	protected $_repair_table	= 'REPAIR TABLE %s';
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Export
+	 *
+	 * @param	array	$params	Preferences
 	 * @return	mixed
 	 */
 	protected function _backup($params = array())
diff --git a/system/database/drivers/mysqli/mysqli_forge.php b/system/database/drivers/mysqli/mysqli_forge.php
index b3c9e8e..0732dfe 100644
--- a/system/database/drivers/mysqli/mysqli_forge.php
+++ b/system/database/drivers/mysqli/mysqli_forge.php
@@ -35,12 +35,19 @@
  */
 class CI_DB_mysqli_forge extends CI_DB_forge {
 
+	/**
+	 * CREATE DATABASE statement
+	 *
+	 * @var	string
+	 */
 	protected $_create_database	= 'CREATE DATABASE %s CHARACTER SET %s COLLATE %s';
 
+	// --------------------------------------------------------------------
+
 	/**
 	 * Process Fields
 	 *
-	 * @param	mixed	the fields
+	 * @param	mixed	$fields
 	 * @return	string
 	 */
 	protected function _process_fields($fields)
diff --git a/system/database/drivers/mysqli/mysqli_utility.php b/system/database/drivers/mysqli/mysqli_utility.php
index 41a9186..345691e 100644
--- a/system/database/drivers/mysqli/mysqli_utility.php
+++ b/system/database/drivers/mysqli/mysqli_utility.php
@@ -35,14 +35,33 @@
  */
 class CI_DB_mysqli_utility extends CI_DB_utility {
 
+	/**
+	 * List databases statement
+	 *
+	 * @var	string
+	 */
 	protected $_list_databases	= 'SHOW DATABASES';
-	protected $_optimize_table	= 'OPTIMIZE TABLE %s';
-	protected $_repair_table	= 'REPAIR TABLE %s';
 
 	/**
-	 * MySQLi Export
+	 * OPTIMIZE TABLE statement
 	 *
-	 * @param	array	Preferences
+	 * @var	string
+	 */
+	protected $_optimize_table	= 'OPTIMIZE TABLE %s';
+
+	/**
+	 * REPAIR TABLE statement
+	 *
+	 * @var	string
+	 */
+	protected $_repair_table	= 'REPAIR TABLE %s';
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Export
+	 *
+	 * @param	array	$params	Preferences
 	 * @return	mixed
 	 */
 	protected function _backup($params = array())
diff --git a/system/database/drivers/oci8/oci8_forge.php b/system/database/drivers/oci8/oci8_forge.php
index fed8141..ad578f8 100644
--- a/system/database/drivers/oci8/oci8_forge.php
+++ b/system/database/drivers/oci8/oci8_forge.php
@@ -35,10 +35,29 @@
  */
 class CI_DB_oci8_forge extends CI_DB_forge {
 
+	/**
+	 * CREATE DATABASE statement
+	 *
+	 * @var	string
+	 */
 	protected $_create_database	= FALSE;
+
+	/**
+	 * DROP DATABASE statement
+	 *
+	 * @var	string
+	 */
 	protected $_drop_database	= FALSE;
+
+	/**
+	 * DROP TABLE statement
+	 *
+	 * @var	string
+	 */
 	protected $_drop_table		= 'DROP TABLE %s';
 
+	// --------------------------------------------------------------------
+
 	/**
 	 * Create Table
 	 *
diff --git a/system/database/drivers/oci8/oci8_utility.php b/system/database/drivers/oci8/oci8_utility.php
index 0c6cfc6..e5aae81 100644
--- a/system/database/drivers/oci8/oci8_utility.php
+++ b/system/database/drivers/oci8/oci8_utility.php
@@ -35,12 +35,17 @@
  */
 class CI_DB_oci8_utility extends CI_DB_utility {
 
+	/**
+	 * List databases statement
+	 *
+	 * @var	string
+	 */
 	protected $_list_databases	= 'SELECT username FROM dba_users'; // Schemas are actual usernames
 
 	/**
-	 * Oracle Export
+	 * Export
 	 *
-	 * @param	array	Preferences
+	 * @param	array	$params	Preferences
 	 * @return	mixed
 	 */
 	protected function _backup($params = array())
diff --git a/system/database/drivers/odbc/odbc_forge.php b/system/database/drivers/odbc/odbc_forge.php
index fb85c2a..699ce99 100644
--- a/system/database/drivers/odbc/odbc_forge.php
+++ b/system/database/drivers/odbc/odbc_forge.php
@@ -35,8 +35,15 @@
  */
 class CI_DB_odbc_forge extends CI_DB_forge {
 
+	/**
+	 * DROP TABLE statement
+	 *
+	 * @var	string
+	 */
 	protected $_drop_table		= 'DROP TABLE %s';
 
+	// --------------------------------------------------------------------
+
 	/**
 	 * Create Table
 	 *
diff --git a/system/database/drivers/odbc/odbc_utility.php b/system/database/drivers/odbc/odbc_utility.php
index 715bfc9..bfa94f4 100644
--- a/system/database/drivers/odbc/odbc_utility.php
+++ b/system/database/drivers/odbc/odbc_utility.php
@@ -35,12 +35,10 @@
  */
 class CI_DB_odbc_utility extends CI_DB_utility {
 
-	protected $_list_databases	= FALSE;
-
 	/**
-	 * ODBC Export
+	 * Export
 	 *
-	 * @param	array	Preferences
+	 * @param	array	$params	Preferences
 	 * @return	mixed
 	 */
 	protected function _backup($params = array())
diff --git a/system/database/drivers/pdo/pdo_forge.php b/system/database/drivers/pdo/pdo_forge.php
index 8c22eb3..e77970c 100644
--- a/system/database/drivers/pdo/pdo_forge.php
+++ b/system/database/drivers/pdo/pdo_forge.php
@@ -35,8 +35,15 @@
  */
 class CI_DB_pdo_forge extends CI_DB_forge {
 
+	/**
+	 * DROP TABLE statement
+	 *
+	 * @var	string
+	 */
 	protected $_drop_table		= 'DROP TABLE %s';
 
+	// --------------------------------------------------------------------
+
 	/**
 	 * Create Table
 	 *
diff --git a/system/database/drivers/pdo/pdo_utility.php b/system/database/drivers/pdo/pdo_utility.php
index ed4d685..03b3092 100644
--- a/system/database/drivers/pdo/pdo_utility.php
+++ b/system/database/drivers/pdo/pdo_utility.php
@@ -35,12 +35,10 @@
  */
 class CI_DB_pdo_utility extends CI_DB_utility {
 
-	protected $_list_databases = FALSE;
-
 	/**
-	 * PDO Export
+	 * Export
 	 *
-	 * @param	array	Preferences
+	 * @param	array	$params	Preferences
 	 * @return	mixed
 	 */
 	protected function _backup($params = array())
diff --git a/system/database/drivers/postgre/postgre_forge.php b/system/database/drivers/postgre/postgre_forge.php
index aac82c1..b08fa51 100644
--- a/system/database/drivers/postgre/postgre_forge.php
+++ b/system/database/drivers/postgre/postgre_forge.php
@@ -35,13 +35,20 @@
  */
 class CI_DB_postgre_forge extends CI_DB_forge {
 
+	/**
+	 * DROP TABLE statement
+	 *
+	 * @var	string
+	 */
 	protected $_drop_table	= 'DROP TABLE IF EXISTS %s CASCADE';
 
+	// --------------------------------------------------------------------
+
 	/**
 	 * Process Fields
 	 *
 	 * @param	mixed	$fields
-	 * @param	array	$primary_keys = array()
+	 * @param	array	$primary_keys
 	 * @return	string
 	 */
 	protected function _process_fields($fields, $primary_keys = array())
@@ -195,7 +202,7 @@
 	 * @param	string	$alter_type	the ALTER type (ADD, DROP, CHANGE)
 	 * @param	string	$table		the table name
 	 * @param	string	$fields		the column definition
-	 * @param	string	$after_field = ''
+	 * @param	string	$after_field
 	 * @return	string
 	 */
 	protected function _alter_table($alter_type, $table, $fields, $after_field = '')
diff --git a/system/database/drivers/postgre/postgre_utility.php b/system/database/drivers/postgre/postgre_utility.php
index 96cd90e..bae1c67 100644
--- a/system/database/drivers/postgre/postgre_utility.php
+++ b/system/database/drivers/postgre/postgre_utility.php
@@ -35,13 +35,26 @@
  */
 class CI_DB_postgre_utility extends CI_DB_utility {
 
+	/**
+	 * List databases statement
+	 *
+	 * @var	string
+	 */
 	protected $_list_databases	= 'SELECT datname FROM pg_database';
-	protected $_optimize_table	= 'REINDEX TABLE %s';
 
 	/**
-	 * Postgre Export
+	 * OPTIMIZE TABLE statement
 	 *
-	 * @param	array	Preferences
+	 * @var	string
+	 */
+	protected $_optimize_table	= 'REINDEX TABLE %s';
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Export
+	 *
+	 * @param	array	$params	Preferences
 	 * @return	mixed
 	 */
 	protected function _backup($params = array())
diff --git a/system/database/drivers/sqlite/sqlite_utility.php b/system/database/drivers/sqlite/sqlite_utility.php
index 15ebc03..2fd5c85 100644
--- a/system/database/drivers/sqlite/sqlite_utility.php
+++ b/system/database/drivers/sqlite/sqlite_utility.php
@@ -35,12 +35,10 @@
  */
 class CI_DB_sqlite_utility extends CI_DB_utility {
 
-	protected $_list_databases	= FALSE;
-
 	/**
-	 * SQLite Export
+	 * Export
 	 *
-	 * @param	array	Preferences
+	 * @param	array	$params	Preferences
 	 * @return	mixed
 	 */
 	protected function _backup($params = array())
diff --git a/system/database/drivers/sqlite3/sqlite3_utility.php b/system/database/drivers/sqlite3/sqlite3_utility.php
index 043c349..6f276eb 100644
--- a/system/database/drivers/sqlite3/sqlite3_utility.php
+++ b/system/database/drivers/sqlite3/sqlite3_utility.php
@@ -35,12 +35,10 @@
  */
 class CI_DB_sqlite3_utility extends CI_DB_utility {
 
-	protected $_list_databases	= FALSE;
-
 	/**
-	 * SQLite Export
+	 * Export
 	 *
-	 * @param	array	Preferences
+	 * @param	array	$params	Preferences
 	 * @return	mixed
 	 */
 	protected function _backup($params = array())
diff --git a/system/database/drivers/sqlsrv/sqlsrv_forge.php b/system/database/drivers/sqlsrv/sqlsrv_forge.php
index 1e5ef4b..8155565 100644
--- a/system/database/drivers/sqlsrv/sqlsrv_forge.php
+++ b/system/database/drivers/sqlsrv/sqlsrv_forge.php
@@ -35,8 +35,15 @@
  */
 class CI_DB_sqlsrv_forge extends CI_DB_forge {
 
+	/**
+	 * DROP TABLE statement
+	 *
+	 * @var	string
+	 */
 	protected $_drop_table	= 'DROP TABLE %s';
 
+	// --------------------------------------------------------------------
+
 	/**
 	 * Create Table
 	 *
diff --git a/system/database/drivers/sqlsrv/sqlsrv_utility.php b/system/database/drivers/sqlsrv/sqlsrv_utility.php
index 5f7d0bd..3150900 100644
--- a/system/database/drivers/sqlsrv/sqlsrv_utility.php
+++ b/system/database/drivers/sqlsrv/sqlsrv_utility.php
@@ -35,13 +35,26 @@
  */
 class CI_DB_sqlsrv_utility extends CI_DB_utility {
 
+	/**
+	 * List databases statement
+	 *
+	 * @var	string
+	 */
 	protected $_list_databases	= 'EXEC sp_helpdb'; // Can also be: EXEC sp_databases
-	protected $_optimize_table	= 'ALTER INDEX all ON %s REORGANIZE';
 
 	/**
-	 * SQLSRV Export
+	 * OPTIMIZE TABLE statement
 	 *
-	 * @param	array	Preferences
+	 * @var	string
+	 */
+	protected $_optimize_table	= 'ALTER INDEX all ON %s REORGANIZE';
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Export
+	 *
+	 * @param	array	$params	Preferences
 	 * @return	bool
 	 */
 	protected function _backup($params = array())