diff --git a/src/amount.ml b/src/amount.ml
index 1a35df2c..5123ac37 100644
--- a/src/amount.ml
+++ b/src/amount.ml
@@ -1,8 +1,7 @@
 (* TODO
      have safe amount arithmetic
      make type private
-     use config currency option:
-       -> functorize or dune virtual-module *)
+     use config currency option *)
 (* Amounts of currency, serialized as `<Currency>:<IntegerPart>.<FractionalPart>`
      Fixed-precision numbers with 8 decimal places.
      - <Currency> must be at most 11 characters long