*Really* adds link

Author: JJ

doc/Language/structures.pod6

@@ -284,6 +284,8 @@ this particular role is mixed in; in this case it will contain the hash it is
 mixed in with; it will contain something else (and possibly work some other way)
 in other case. This role will provide the C<last> method to any variable it's
 mixed with, providing new, attachable, functionalities to I<regular> variables.
+Roles can even be L<added to existing variables using the C<does>
+keyword|/language/objects#Mixins_of_Roles>.
 
 L<Subsets|/language/typesystem#subset> can also be used to constrain the
 possible values a variable might hold; they are Perl 6 attempt at