diff --git a/index.php b/index.php
index 28be1ff..e8c9a8a 100644
--- a/index.php
+++ b/index.php
@@ -9,8 +9,8 @@
 
 define("_DEF_VSPF_", true); // compatible to VSPF
 define("_DEF_RSF_", true); // compatible to RSF
-define("APP_DEVELOPMENT", false); // add development flag
-define("DOC_EOL", "\r\n"); // add 'the end of line' of document
+define("APP_DEVELOPMENT", false); // set the status of development
+define("DOC_EOL", "\r\n"); // set the 'end of line' commonly
 
 // check if current status is development
 if(APP_DEVELOPMENT == true) {