diff --git a/LICENSE b/LICENSE
index 0664aff..9da044b 100644
--- a/LICENSE
+++ b/LICENSE
@@ -4,8 +4,14 @@ Copyright (c) 2012,2013 Lu Wang <coolwanglu@gmail.com> and other contributors
 You are free and welcome to modify pdf2htmlEX.
 
 If you want to use pdf2htmlEX (or your modified version) in your online service,
-you should credit pdf2htmlEX with a proper link to https://github.com/coolwanglu/pdf2htmlEX
-in the homepage of your service, or a page directly accessible from the homepage of the service.
+through which a user can provide one or more files through a computer network, 
+and view any part of the result produced by pdf2htmlEX (or your modified version) on 
+the file(s) provided by the user, you should credit pdf2htmlEX with a proper link to https://github.com/coolwanglu/pdf2htmlEX in the homepage of your service, 
+or a page directly accessible from the homepage of the service.
+
+For example, if pdf2htmlEX (or your modified version) must be called after a user
+upload some files and before the user can see the result of the files, you should 
+credit pdf2htmlEX.
 
 
 Files: *