diff --git a/src/database.ml b/src/database.ml
index 140d0082..b4121bcc 100644
--- a/src/database.ml
+++ b/src/database.ml
@@ -1,5 +1,7 @@
 (* TODO
-   GNU Taler db-events
+   - pg.ml
+   - preflight
+   - GNU Taler db-events?
    https://git.gnunet.org/gana.git/tree/gnu-taler-db-events/registry.rec *)
 
 let test req server _ =
diff --git a/src/mte.ml b/src/mte.ml
index 8f87a878..eb120a9b 100644
--- a/src/mte.ml
+++ b/src/mte.ml
@@ -129,6 +129,7 @@ let () =
     { caqti_switch; db_uri= Config.Exchangedb_postgres.config }
   in
   let devices =
+    (* todo: rm unneeded env parameter from secmod devices *)
     Vif.Devices.[ Devices.secmod_signkey; Devices.secmod_denom; Devices.caqti ]
   in
   let middlewares = Vif.Middlewares.[] in