Fixed typos
diff --git a/system/database/DB_forge.php b/system/database/DB_forge.php
index 865498f..dde2855 100644
--- a/system/database/DB_forge.php
+++ b/system/database/DB_forge.php
@@ -143,7 +143,7 @@
 	protected $_unsigned		= TRUE;
 
 	/**
-	 * NULL value representatin in CREATE/ALTER TABLE statements
+	 * NULL value representation in CREATE/ALTER TABLE statements
 	 *
 	 * @var	string
 	 */