man nmh lists the user's profile as SHOME/.mh-profile.
Following patch amends that to $HOME/.mh_profile.
--- man/nmh.man 2016-11-20 01:50:18.000000000 +0000
+++ man/nmh.man.rev 2016-11-20 13:48:20.000000000 +0000
@@ -546,7 +546,7 @@
.B nmh
library commands
.TP
-$HOME/\&.mh\-profile
+$HOME/\&.mh_profile
The user's nmh profile
.ne 4
.SH "SEE ALSO"
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