diff --git a/application/config/aauth.php b/application/config/aauth.php
index 523f026..b2a7080 100644
--- a/application/config/aauth.php
+++ b/application/config/aauth.php
@@ -38,7 +38,7 @@ defined('BASEPATH') OR exit('No direct script access allowed');
 | 	['max']                            	Maximum char long for Password
 | 	['min']                            	Minimum char long for Password
 |
-| 	['valid_chars']                    	Valid chars for username. Non alphanumeric characters that are allowed by default
+| 	['additional_valid_chars']          Additional valid chars for username. Non alphanumeric characters that are allowed by default
 |
 | 	['ddos_protection']                	If it is true, the user will be banned temporary when he exceed the login 'try'
 |
@@ -95,7 +95,7 @@ $config_aauth["default"] = array(
 	'max'                            => 13,
 	'min'                            => 5,
 
-	'valid_chars'                    => array(),
+	'additional_valid_chars'         => array(),
 
 	'ddos_protection'                => true,
 
diff --git a/application/libraries/Aauth.php b/application/libraries/Aauth.php
index 63ffbd3..fb48800 100644
--- a/application/libraries/Aauth.php
+++ b/application/libraries/Aauth.php
@@ -723,7 +723,7 @@ class Aauth {
 			$this->error($this->CI->lang->line('aauth_error_password_invalid'));
 			$valid = FALSE;
 		}
-		if ($name != FALSE && !ctype_alnum(str_replace($this->config_vars['valid_chars'], '', $name))){
+		if ($name != FALSE && !ctype_alnum(str_replace($this->config_vars['additional_valid_chars'], '', $name))){
 			$this->error($this->CI->lang->line('aauth_error_username_invalid'));
 			$valid = FALSE;
 		}
@@ -819,7 +819,7 @@ class Aauth {
 				$this->error($this->CI->lang->line('aauth_error_update_username_exists'));
 				$valid = FALSE;
 			}
-			if ($name !='' && !ctype_alnum(str_replace($this->config_vars['valid_chars'], '', $name))){
+			if ($name !='' && !ctype_alnum(str_replace($this->config_vars['additional_valid_chars'], '', $name))){
 				$this->error($this->CI->lang->line('aauth_error_username_invalid'));
 				$valid = FALSE;
 			}