diff --git a/README b/README
index 9521fd6a..bc94b07c 100644
--- a/README
+++ b/README
@@ -259,4 +259,5 @@ TODOs / Open Bugs
   - Additional internal cell types: $pla and $lut
   - Support for registering designs (as collection of modules) to CellTypes
   - Smarter resource sharing pass (add MUXes and get rid of duplicated cells)
+  - Refactoring of AST frontend (clean expr width/sign code, AST passes)