-String value of parameters will be subjected to regexp substitution, as
-the @code{to-group} example shows.
+All clauses that matches the group name will be used, but the last
+setting ``wins''. So if you have two clauses that both match the
+group name, and both set, say @code{display}, the last setting will
+override the first.
+
+Parameters that are strings will be subjected to regexp substitution,
+as the @code{to-group} example shows.