Index: lib/resolv.rb
===================================================================
--- lib/resolv.rb	(revision 20924)
+++ lib/resolv.rb	(working copy)
@@ -608,7 +608,7 @@
         while (now = Time.now) < timelimit
           timeout = timelimit - now
           if !IO.select([@sock], nil, nil, timeout)
-            raise ResolvTimeout
+            raise ResolvTimeout, "timed out while resolving the address"
           end
           reply, from = recv_reply
           begin