--- a/css.rst	Sat Jan 28 14:37:19 2017 +0200
+++ b/css.rst	Sat Jan 28 14:38:54 2017 +0200
@@ -21,6 +21,8 @@
 https://www.w3.org/Style/CSS/current-work
   Status of all modules.
 https://www.w3.org/TR/CSS2/
+  CSS level 2 at latest rev.
+https://www.w3.org/TR/CSS21/
   CSS level 2 rev 1.
 
 Adding CSS to HTML