diff --git a/tools/dune b/tools/dune
index 4d53a4b2..dc7b5c6a 100644
--- a/tools/dune
+++ b/tools/dune
@@ -3,3 +3,5 @@
  (name offline)
  (modules offline offline_impl offline_bin)
  (libraries cmdliner bos fmt mirage-crypto ptime mte vif))
+
+; todo depends on curl