-program is not running as the super-user (or with the bf(--no-super)
-option), only groups that the
-receiver is a member of will be preserved. By default, the preservation
-is done by name, but may fall back to using the ID number in some
-circumstances. See the bf(--numeric-ids) option for a full discussion.
+program is not running as the super-user (or if bf(--no-super) was
+specified), only groups that the invoking user on the receiving side
+is a member of will be preserved.
+Without this option, the group is set to the default group of the invoking
+user on the receiving side.
+
+The preservation of group information will associate matching names by
+default, but may fall back to using the ID number in some circumstances
+(see also the bf(--numeric-ids) option for a full discussion).