Insert correct OpenSearch base URL.
diff --git a/Doc/conf.py b/Doc/conf.py
index e4641ea..da70669 100644
--- a/Doc/conf.py
+++ b/Doc/conf.py
@@ -86,7 +86,7 @@
 }
 
 # Output an OpenSearch description file.
-html_use_opensearch = True
+html_use_opensearch = 'http://docs.python.org/dev'
 
 # Additional static files.
 html_static_path = ['tools/sphinxext/static']