diff --git a/lockfile.php b/lockfile.php
index 91d1154..f58e83d 100644
--- a/lockfile.php
+++ b/lockfile.php
@@ -18,7 +18,8 @@ class lockfile
     if (!is_dir (dirname ($this->storagelock)))
       @mkdir (dirname ($this->storagelock));
     if (!is_dir (dirname ($this->storagelock)))
-      throw new Exception ("Can't create '".dirname ($this->storagelock)."'",
+      throw new Exception ("Can't create '".dirname ($this->storagelock).
+                           "' directory for lockfile",
                            500);
     $lockid = uniqid() . '_' . md5 (mt_rand());
     $startTime = microtime (TRUE);