diff --git a/authentication.php b/authentication.php
index e41c1af..48ee381 100644
--- a/authentication.php
+++ b/authentication.php
@@ -334,7 +334,13 @@ class authentication
         foreach ($serversParam as $param=>$value)
         {
           if ($this->debug)
-            echo "Add param '$param' with value '$value' to auth$method\n";
+          {
+            if (is_array ($value))
+              echo "Add param '$param' to auth$method : ".
+                var_export ($value, true)."\n";
+            else
+              echo "Add param '$param' with value '$value' to auth$method\n";
+          }
           $authmethod->$param = $value;
         }
         $authmethod->connect ();