-This will store exactly one message, containing the sum of the
-parts. It doesn't matter whether the partials are specified in
-order, since
-.B mhstore
-will sort the partials, so that they
-are combined in the correct order. But if
-.B mhstore
-can not
-locate every partial necessary to reassemble the message, it will
-not store anything.
+With
+.I auto
+and
+.IR suffix ,
+.I n
+is the lowest unused number, starting from one, in the same form. If
+a filename does not have an extension (following a '.'), then
+.I auto
+and
+.I suffix
+create a new file of the form
+.I name-n
+and
+.IR name.n ,
+respectively. With
+.I never
+and
+.IR ask ,
+the exit status of
+.B mhstore
+will be the number of files that were requested but not stored.
+.PP
+With
+.IR ask ,
+if standard input is connected to a terminal, the user is prompted to
+respond
+.IR yes ,
+.IR no ,
+or
+.IR rename ,
+to whether the file should be overwritten. The responses
+can be abbreviated. If the user responds with
+.IR rename ,
+then
+.B mhstore
+prompts the user for the name of the new file to be created. If it is
+a relative path name (does not begin with '/'), then it is relative to
+the current directory. If it is an absolute or relative path to a
+directory that does not exist, the user will be prompted whether to
+create the directory. If standard input is not connected to a
+terminal,
+.I ask
+behaves the same as
+.IR always .