--- factorcss/FactorCSS.hs	2004/12/27 19:11:07	62
+++ factorcss/FactorCSS.hs	2004/12/27 19:45:02	63
@@ -1,4 +1,19 @@
--- Factor a CSS stylesheet
+--
+-- This file is part of FactorCSS
+-- Licensed under the MIT License,
+--                http://www.opensource.org/licenses/mit-license
+-- Copyright 2004 James Bursa <james@semichrome.net>
+--
+
+-- Factor a CSS stylesheet.
+--
+-- This tool takes a CSS stylesheet on input and produces an almost equivalent
+-- stylesheet on output, but with rulesets split, combined, and reordered to
+-- "factor out" common declarations. This helps reveal shared components. The
+-- resulting stylesheet may also be smaller.
+--
+-- The only known case where the output is not equivalent to the input is when
+-- the stylesheet depends on the order of rules (see CSS 2.1 6.4.1).
 
 import List
 import Tokeniser