diff --git a/model_signing/serialize_test.py b/model_signing/serialize_test.py
index a33126b0..f4a23eb9 100644
--- a/model_signing/serialize_test.py
+++ b/model_signing/serialize_test.py
@@ -818,6 +818,3 @@ def test_folder_shard_chunks(self):
                 rc = Serializer._serialize_v1(model, c, shard, sig_path)
                 assert (rc == r)
         cleanup_model(model)
-
-    # TODO(#57): directory support.
-    # TODO: different chunk and shard sizes.