mh-folders.man: note that folders should not be named numerically

diff --git a/man/mh-folders.man b/man/mh-folders.man
index 0fbdddd..02986dc 100644 (file)
--- a/man/mh-folders.man
+++ b/man/mh-folders.man
@@ -153,6 +153,18 @@ platform, and it is for popular platforms.  That default should also
 be the same as used by the
 .B mail
 program, if provided on the platform.
 be the same as used by the
 .B mail
 program, if provided on the platform.

+.PP
+.SS Naming
+.B nmh
+folders can be given arbitrary names, with one exception:
+folders should not be given all-numeric names.  This
+limitation results from
+.B nmh
+messages themselves being stored
+in numerically named files -- allowing folders to be named
+similarly would make
+.B nmh
+slower, and introduce usage ambiguities.

 .SH FILES
 .fc ^ ~
 .nf
 .SH FILES
 .fc ^ ~
 .nf