RDoc ignores second argument of include.

I found that RDoc ignores second (and maybe subsequent) argument of
include.

% cat t.rb 
module M
end

module N
end

class C
  include M, N
end
% rdoc -q t.rb
% w3m -dump doc/classes/C.html
C ^(Class)

In:      t.rb  
Parent:  Object

Included Modules

M

[Validate]


The "Included Modules" section should contain N addition to M, I
think.
-- 
Tanaka Akira