[leafnode-list] Manual group addition

[Andrew Cranson]

> Assume you want to add "my.group" which has the description "my
> discussions", you could do this (this only works with 1.9.50 and
> 1.9.51):
>
> echo >groups "my.group my discussions"
> checkgroups groups
> rm checkgroups

Will that be permanent? (Thanks!)