+@subsubsection Alias name for index
+
+You can define an alias name for index.
+
+Example:
+
+@example
+(setq elmo-nmz-index-alias-alist
+ '(("cache" . "~/.elmo/cache")
+ ("docs" . "~/documents")))
+@end example
+
+Above definition defines two index aliases.
+You can specify
+
+@example
+[wanderlust]cache
+@end example
+
+to execute a namazu search with keyword @samp{wanderlust} using a index in the
+directory @file{~/.elmo/cache}.
+
+@subsubsection Multiple indices
+
+You can specify a list for @code{elmo-nmz-default-index-path} and
+@code{elmo-nmz-index-alias-alist}.
+When list is specified, all index contained in the list is used as the
+namazu indices.
+
+Example:
+
+@example
+(setq elmo-nmz-index-alias-alist
+ '(("all" . ("~/.elmo/cache" "~/documents"))
+ ("cache" . "~/.elmo/cache")))
+@end example
+
+Using above alias setting, you can specify
+
+@example
+[wanderlust]all
+@end example
+
+to execute a namazu search with keyword @samp{wanderlust} using indices in the
+directory @file{~/.elmo/cache} and @file{~/documents}.