diff --git a/compiler/lib/js_traverse.ml b/compiler/lib/js_traverse.ml
index 5045882fa3..4636d70011 100644
--- a/compiler/lib/js_traverse.ml
+++ b/compiler/lib/js_traverse.ml
@@ -1754,7 +1754,10 @@ class simpl =
               , (Return_statement (Some e1, _), _)
               , Some (Return_statement (Some e2, _), _) ) ->
               ( Return_statement
-                  (Some (ECond (cond, e1, e2)), U (*ZZZ Use end of function? *))
+                  ( Some (ECond (cond, e1, e2))
+                  , U
+                    (*TODO: it would be better to use the location of the
+                      end of the function, but we can't easily get it. *) )
               , loc )
               :: rem
           (* if (e1) v1 = e2 else v1 = e3 --> v1 = e1 ? e2 : e3 *)