diff --git a/gtsam/base/std_optional_serialization.h b/gtsam/base/std_optional_serialization.h
index 051b84908..f59c71cd3 100644
--- a/gtsam/base/std_optional_serialization.h
+++ b/gtsam/base/std_optional_serialization.h
@@ -95,8 +95,6 @@ void serialize(Archive& ar, std::optional<T>& t, const unsigned int version) {
   boost::serialization::split_free(ar, t, version);
 }
 
-// derive boost::xml_archive_impl for archiving std::optional<T> with xml
-
 }  // namespace serialization
 }  // namespace boost