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@@ -6,6 +6,13 @@ CSSEmbed is a simple utility to automate creation of CSS files with embedded dat
 
 h2. Resolving Files
 
+When CSSEmbed comes across a URL reference in CSS (@url(filename)@), it inspects the filename to determine where the file is actually located. If the filename begins with "http://", then the file is downloaded from that location. Files that don't begin with "http://" are assumed to be local and their location is resolved relative to the location of the CSS file. If, for example, the CSS code contains @url(../../image.png)@, then CSSEmbed looks to the directory that is two levels above the CSS file for @image.png@. 
+
+You can force a specific resolution by using the @--root@ option on the command line and specifying what the root should be. For example:
+
+bc. java -jar cssembed-0.1.0.jar --root http://www.nczonline.net/images styles.css
+
+This causes all image URLs to be prepended with @http://www.nczonline.net/images% before attempting resolution (this happens only for those URLs that don't already have "http://" at the beginning.
 
 h2. Data URIs