Add 'Options MultiViews' to the wiki directory's configuration in Apache.
-When `usedirs` is enabled, one has to set `DirectoryIndex index` for
-the wiki context.
+When `usedirs` is enabled, you should also set `DirectoryIndex index`.
+
+These settings are also recommended, in order to avoid serving up rss files
+as index pages:
+
+ AddType application/rss+xml;qs=0.8 .rss
+ AddType application/atom+xml;qs=0.8 .atom
For details, see [Apache's documentation](http://httpd.apache.org/docs/2.2/content-negotiation.html).