diff --git a/index.php b/index.php
index db88728..94ad041 100644
--- a/index.php
+++ b/index.php
@@ -9,6 +9,7 @@
 
 define("_DEF_VSPF_", true); // compatible to VSPF
 define("_DEF_RSF_", true); // compatible to RSF
+define("DOC_EOL", "\r\n"); // add common 'the end of line' expression
 
 // define system modules
 $load_systems = array("base", "storage", "config", "database", "uri", "security", "logger");