diff --git a/src/bin_sig.ml b/src/bin_sig.ml
index 78383a23..1aee423e 100644
--- a/src/bin_sig.ml
+++ b/src/bin_sig.ml
@@ -2,8 +2,6 @@
 
 open Bin_type
 
-(* TODO keep this?
-   some of those are actuall ecdhe, or union of eddsa|ecdhe *)
 module Aliases = struct
   module Timestamp = struct
     type t = Time.Timestamp.t
@@ -40,6 +38,9 @@ module Aliases = struct
   end
 
   (* - Keys - *)
+
+  (* TODO keep this?
+     some of those are actuall ecdhe, or union of eddsa|ecdhe *)
   open Crypto
   module PursePublicKey = EddsaPublicKey
   module AuditorPublicKeyP = EddsaPublicKey