diff --git a/examples/filters/xpath-sifter/xpath-sifter.ini b/examples/filters/xpath-sifter/xpath-sifter.ini
index 1a90b1d..f739d09 100644
--- a/examples/filters/xpath-sifter/xpath-sifter.ini
+++ b/examples/filters/xpath-sifter/xpath-sifter.ini
@@ -29,6 +29,11 @@ name = Category 'two' (from Site Without a Categorised Feed)
 # Here's a URL quoted version:
 filters = xpath_sifter.py?require=//atom%3Acategory%5B%40term%3D%27two%27%5D
 
+# Here's a way to get the URL quoted version on the command line:
+# python -c "import urllib; print urllib.quote('STRING');"
+# eg
+# python -c "import urllib; print urllib.quote('atom:category[@term=\'two\']');"
+
 ### SECOND FEED: FILTER ON TITLE ###
 
 # The verbose blogger whose feed is below blogs about many subjects but we are