-# corresponding groups. If this is set then when a new account
-# is created, the corresponding per-user group will be created as
-# well, and per-user groups are created for existing accounts if
-# necessary (if account creation is enabled). If the gid or
-# group name for a per-user group is already taken for a
-# different group name or gid this will be logged, and processing
-# of that account will be inhibited, but it is not a fatal
-# error. The default is `usergroups'.
+# corresponding groups, or all be part of a particular group. If
+# usergroups is set, when a new account is created, the
+# corresponding per-user group will be created as well, and
+# per-user groups are created for existing accounts if necessary
+# (if account creation is enabled). If the gid or group name for
+# a per-user group is already taken for a different group name or
+# gid this will be logged, and processing of that account will be
+# inhibited, but it is not a fatal error. If defaultgid is used,
+# then newly-created accounts will be made a part of that group,
+# and the groups of existing accounts will be left alone. If
+# nousergroups is specified then no new accounts can be created,
+# and existing accounts' groups will be left alone. The default
+# is `usergroups'.