diff --git a/config.inc.php b/config.inc.php
index 5126d3fb..bab0dc6d 100644
--- a/config.inc.php
+++ b/config.inc.php
@@ -229,13 +229,14 @@ $CONF['password_validation'] = array(
     '/.{5}/'                => 'password_too_short 5',      # minimum length 5 characters
     // '/([a-zA-Z].*){3}/'     => 'password_no_characters 3',  # must contain at least 3 consecutive characters
     '/([0-9].*){2}/'        => 'password_no_digits 2',      # must contain at least 2 digits
-    'length_check'          => function($password) { return strlen(trim($password)) > 2; }, // not unicode safe.
-    /*  support a 'callable' value which if it returns a non-empty string will be assumed to have failed. */
+
+    /*  support a 'callable' value which if it returns a non-empty string will be assumed to have failed, non-empty string should be a PALANG key */
+    'length_check'          => function($password) { if (strlen(trim($password)) < 3) { return 'password_too_short'; } }, // not unicode safe.
 
     /**
-     * 'any-key' =>  function($password) { 
-     *                   if ( rand(0, 5) == 0 ) { return 'password_too_short'; } 
-     *                   // add some remote api check here ... or whatever 
+     * 'any-key' =>  function($password) {
+     *                   if ( rand(0, 5) == 0 ) { return 'password_too_short'; }
+     *                   // add some remote api check here ... or whatever
      *               },
      */
 );