diff --git a/src/voodoo-prep/jsoo_toplevel.ml b/src/voodoo-prep/jsoo_toplevel.ml
index 96010759..3ccadb56 100644
--- a/src/voodoo-prep/jsoo_toplevel.ml
+++ b/src/voodoo-prep/jsoo_toplevel.ml
@@ -52,4 +52,8 @@ let to_yojson t =
   let cma = ("cma", `String (js_name t)) in
   let dep_cmas = ("dep_cmas", `List (List.map Jsoo_cma.to_yojson t.dep_cmas)) in
   let cmis = ("cmis", `List (List.map Jsoo_cmi.to_yojson t.cmis)) in
-  `Assoc [ package; cma; dep_cmas; cmis ]
+  let js_files =
+    ( "js_files",
+      `List (List.map (fun s -> `String (Fpath.to_string s)) t.js_files) )
+  in
+  `Assoc [ package; cma; dep_cmas; cmis; js_files ]
diff --git a/test/toplevel.t b/test/toplevel.t
index 3052fdcd..4f825a4d 100644
--- a/test/toplevel.t
+++ b/test/toplevel.t
@@ -10,6 +10,7 @@ Generate the toplevel documentation
   Ignoring jsoo option passed: -linkall
 
   $ voodoo-prep jsoo -p $PKG
+  voodoo-prep: [INFO] Built jsoo/universes/88/toplevel/1.0/toplevel.cma.js ✅
 
   $ voodoo-do -p $PKG -b 2> /dev/null
 
@@ -453,7 +454,8 @@ Generates a toplevels.json file
         "/toplevels/jsoo/universes/45/ocaml-base-compiler/5.0.0/lib/ocaml/stdlib__Uchar.cmi",
         "/toplevels/jsoo/universes/45/ocaml-base-compiler/5.0.0/lib/ocaml/stdlib__Option.cmi",
         "/toplevels/jsoo/universes/45/ocaml-base-compiler/5.0.0/lib/ocaml/stdlib__Effect.cmi"
-      ]
+      ],
+      "js_files": []
     }
   ]