diff --git a/README b/README
index 7f2ca78..5045a42 100644
--- a/README
+++ b/README
@@ -6,6 +6,7 @@ License: GNU-GPLv2
 System Requirements:
 Linux/POSIX
 PHP
+CSS
 GetText
 UFPDF - PDF generation library from http://acko.net/node/56
 OpenSSL - X.509 toolkit from http://www.openssl.org/