@kindex group@r{, customization keyword}
@item :group @var{group}
-Put this customization item in group @var{group}. When you use
-@code{:group} in a @code{defgroup}, it makes the new group a subgroup of
-@var{group}.
+Put this customization item in group @var{group}. If this keyword is
+missing from a customization item, it'll be placed in the same group
+as the previous customization item that had a @code{:group} spec (in
+the same file).
+
+When you use @code{:group} in a @code{defgroup}, it makes the new
+group a subgroup of @var{group}.
If you use this keyword more than once, you can put a single item into
more than one group. Displaying any of those groups will show this