-When --mbox is specified, the output is formatted to resemble
-UNIX mailbox format, and can be concatenated together for
-processing with applymbox.
+Each output file is numbered sequentially from 1, and uses the
+first line of the commit message (massaged for pathname safety) as
+the filename. The names of the output files are printed to standard
+output, unless the --stdout option is specified.
+
+If -o is specified, output files are created in <dir>. Otherwise
+they are created in the current working directory.
+
+If -n is specified, instead of "[PATCH] Subject", the first line
+is formatted as "[PATCH n/m] Subject".