diff --git a/Auth_phpbb.php b/Auth_phpbb.php
index a7b75ba..146c0c9 100644
--- a/Auth_phpbb.php
+++ b/Auth_phpbb.php
@@ -212,6 +212,18 @@ class Auth_phpBB extends AuthPlugin implements iAuthPlugin
      */
     private $_WikiGroupName;
 
+    /**
+     * Whether to set usernames from the
+     * username_clean (false) colum or username
+     * (true) column in the phpbb users tables.
+     * Should be true in most cases, is added for
+     * legacy support due to previous versions
+     * setting usernames to lowercase.
+     *
+     * @var bool
+     */
+    private $_UseCanonicalCase;
+
     /**
      * Constructor
      *
@@ -234,6 +246,13 @@ function __construct($aConfig)
         $this->_WikiGroupName   = $aConfig['WikiGroupName'];
         $this->_LoginMessage    = $aConfig['LoginMessage'];
 
+        // If undefined (i.e. user is using an old config) set to false
+        if (isset($aConfig['UseCanonicalCase'])) {
+            $this->_UseCanonicalCase = $aConfig['UseCanonicalCase'];
+        } else {
+            $this->_UseCanonicalCase = false;
+        }
+
         // Only assign the database values if a external database is used.
         if ($this->_UseExtDatabase == true)
         {
@@ -478,10 +497,10 @@ public function getCanonicalName( $username )
         $username = $fresMySQLConnection->escape_string($username);
 
         // Check Database for username. We will return the correct casing of the name.
-        $fstrMySQLQuery = sprintf("SELECT `username_clean`
+        $fstrMySQLQuery = sprintf("SELECT `%s`
                 FROM `%s`
                 WHERE `username_clean` = ?
-                LIMIT 1", $this->_UserTB);
+                LIMIT 1", ($this->_UseCanonicalCase ? "username" : "username_clean"), $this->_UserTB);
 
         // Query Database.
         $fresStatement = $fresMySQLConnection->prepare($fstrMySQLQuery);
diff --git a/README.md b/README.md
index 8f12397..f11cd85 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,17 @@ Open LocalSettings.php. Put this at the bottom of the file. Edit as needed.
         require_once './extensions/Auth_phpbb.php';
         
         $wgAuth_Config = array(); // Clean.
+
+        $wgAuth_Config['UseCanonicalCase'] = true;      // Setting this to true causes the mediawiki usernames
+                                                        // to match the casing of the phpbb ones (except with
+                                                        // the first letter set uppercase.)
+                                                        // Setting this to false causes usernames to be all
+                                                        // lowercase except for the first character.
+                                                        // Before June 2016 this setting was always false,
+                                                        // changing it to true on an install where it previously
+                                                        // was false will cause users with uppercase characters
+                                                        // to appear as separate users from their previous
+                                                        // all-lowercase account.
         
         $wgAuth_Config['WikiGroupName'] = 'Wiki';       // Name of your PHPBB group
                                                         // users need to be a member