diff --git a/examples/filters/xpath-sifter/xpath-sifter.ini b/examples/filters/xpath-sifter/xpath-sifter.ini
index fedad56..846bf03 100644
--- a/examples/filters/xpath-sifter/xpath-sifter.ini
+++ b/examples/filters/xpath-sifter/xpath-sifter.ini
@@ -19,7 +19,13 @@
 # category tag with the term attribute equal to 'two'
 [http://example.com/uncategorised.xml]
 name = Category 'two' (from Site Without a Categorised Feed)
-filters = xpath_sifter.py?require=//atom:category[@term='two']
+
+# This first version is the readable way to do it, but you'll run into trouble
+# if you have any special characters, like spaces, in your require string
+# filters = xpath_sifter.py?require=//atom:category[@term='two']
+
+# Here's a URL quoted version:
+filters = xpath_sifter.py?require=//atom%3Acategory%5B%40term%3D%27two%27%5D
 
 # The verbose blogger whose feed is below blogs about many subjects but we are
 # only interested in entries about Venus. She does not use categories but
@@ -27,7 +33,11 @@ filters = xpath_sifter.py?require=//atom:category[@term='two']
 # tag's text for the text 'Venus'
 [http://example.com/verbose.xml]
 name = Venus (from Verbose Site)
-filters = xpath_sifter.py?require=//atom:title[contains(.,'Venus')]
+
+# Non-quoted version
+# filters = xpath_sifter.py?require=//atom:title[contains(.,'Venus')]
+# Quoted version
+filters = xpath_sifter.py?atom%3Atitle%5Bcontains%28.%2C%27Venus%27%29%5D
 
 # We can include other feeds that do not have the filter applied
 [http://example.com/normal.xml]