--- /dev/null
+The Makefile, package.json, scripts, styleguide-template, and
+mediawiki.ui/styleguide.md files and directories here and in
+resources/src/mediawiki.ui/ support the automatic generation
+of CSS documentation from the source LESS files using kss for
+node.js, https://github.com/kneath/kss
+
+To build and open in your web browser, run:
+
+MEDIAWIKI_LOAD_URL=mediawiki_hostname/w/load.php make kssopen
+
+For example,
+
+MEDIAWIKI_LOAD_URL=1.2.3.4/w/load.php make kssopen
+
+If MediaWiki is running on localhost, you can omit MEDIAWIKI_LOAD_URL.
+
+To rebuild without opening the web browser, run:
+
+MEDIAWIKI_LOAD_URL=mediawiki_hostname/w/load.php make
+
+When modifying styleGuideModules.txt, keep the list in strict alphabetical order (with no extra formatting), so CSS loads in the same order as ResourceLoader's addModuleStyles does; this can affect rendering.