DirectoryIndex file 
Where file is a file name. 
Only one DirectoryIndex directive is allowed in the server configuration file.
DirectoryIndex index.html 
DirectoryIndex .index.html 
This would set DirectoryIndex to .index.html. A request for
/dir would cause the server to look for the file DocumentRoot/dir/.index.html. If
found, the server would send it back to the client. Otherwise, it
would create and return an index from the filesystem. 
Return to Resource Configuration File Overview