auto doc builder notes

docs/README.md

@@ -7,13 +7,10 @@ These are Sphinx docs, automatically built at http://docs.wagtail.io when the ma
 
 Then ``make html`` from this directory, and open ``_build/html/index.html`` in your browser.
 
-To auto-build your local docs when you save:
+We've provided a watchdog script (based on @jacobian's [snippet](http://jacobian.org/writing/auto-building-sphinx/)) to auto-build your local docs when you save them. Install watchdog:
 
     pip install watchdog
-    $ watchmedo shell-command \
-              --patterns="*.rst" \
-              --ignore-pattern='_build/*' \
-              --recursive \
-              --command='make html'
+
+Then run ``./autobuild.sh`` before you start editing.
 
 The online editor at http://rst.ninjs.org/ is a helpful tool for checking reStructuredText syntax.