+You can specify followings as 2nd @samp{ACTION}.
+
+@enumerate
+@item
+folder name
+
+If some string is specified, it will be regarded as the destination
+folder, and the message will be appended to it.
+
+@item
+@samp{delete}
+
+If the symbol @samp{delete} is specified, delete the substance of the
+message in @code{elmo-split-folder}
+
+@item
+@samp{noop}
+
+If the symbol @samp{noop} is specified, do nothing on the message and
+keep it as it is.
+
+@item
+function
+
+If some function is specified, execute it.
+@end enumerate
+
+If the message passes all rules, it will be dealed along @samp{ACTION}
+specified by @code{elmo-split-default-action}.
+