diff --git a/README.md b/README.md
index 4f18455..92d812d 100644
--- a/README.md
+++ b/README.md
@@ -8,5 +8,7 @@ management.
 each release is tagged, which should enable identifying and isolating breaking
 changes easily.
 
+todo: migrate certain attributes to [enums](https://stackoverflow.com/questions/55316378/how-to-handle-enums-in-dhall).
+
 ### LICENSE
 AGPL-3.0-only (see [LICENSE](LICENSE) for details).