pure-Ruby DSL is passing all tests!
diff --git a/ruby/Rakefile b/ruby/Rakefile
index 221e9b5..523d4de 100644
--- a/ruby/Rakefile
+++ b/ruby/Rakefile
@@ -8,6 +8,7 @@
 well_known_protos = %w[
   google/protobuf/any.proto
   google/protobuf/api.proto
+  google/protobuf/descriptor.proto
   google/protobuf/duration.proto
   google/protobuf/empty.proto
   google/protobuf/field_mask.proto