diff --git a/ChangeLog b/ChangeLog
index d0d27b241e..29cb438966 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jul  1 00:18:40 2005  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* lib/delegate.rb (Delegator::respond_to): respond_to? must check
+	  destination object.  [ruby-talk:146894]
+
 Thu Jun 30 23:52:12 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* signal.c (trap): non-string trap hander was ignored.
diff --git a/lib/delegate.rb b/lib/delegate.rb
index 72b52f3d45..1d0ebed07a 100644
--- a/lib/delegate.rb
+++ b/lib/delegate.rb
@@ -57,6 +57,11 @@ class Delegator
     target.__send__(m, *args)
   end
 
+  def respond_to?(m)
+    return true if super
+    return self.__getobj__.respond_to?(m)
+  end
+
   def __getobj__
     raise NotImplementedError, "need to define `__getobj__'"
   end
@@ -115,6 +120,10 @@ def DelegateClass(superclass)
       end
       @_dc_obj.__send__(m, *args)
     end
+    def respond_to?(m)
+      return true if super
+      return @_dc_obj.respond_to?(m)
+    end
     def __getobj__
       @_dc_obj
     end