diff --git a/config.sample.php b/config.sample.php
index 941d736..3f1f9b7 100644
--- a/config.sample.php
+++ b/config.sample.php
@@ -1,6 +1,8 @@
 <?php
 $CONVERT_CMD = "/usr/local/bin/convert";
 $PDFTK_CMD = "/usr/local/bin/pdftk";
+$GS_CMD = "gs -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=%s.pdf";
+
 
 $mailHost = 'mailserver.example.com';   // Specify main and backup server
 $mailPort = 587;                        // Set the SMTP port