diff --git a/config.php b/config.php
index b35be42..aa78063 100644
--- a/config.php
+++ b/config.php
@@ -70,7 +70,7 @@ class config
   {
     $this->selectConfFile ();
     if (!array_key_exists ($param, $this->default))
-      throw new Exception ("Unknown parameter '$param'", 500);
+      throw new Exception ("Unknown configuration parameter '$param'", 500);
     if (!file_exists ($this->confFile))
     {
       if (@file_put_contents ($this->confFile,