diff --git a/src/binary_formats.ml b/src/binary_formats.ml
index 94962fda..a16aadb5 100644
--- a/src/binary_formats.ml
+++ b/src/binary_formats.ml
@@ -217,7 +217,8 @@ module GNUNET_RsaPublicKey = struct
     e: Z.t;
   }
 
-  (* need to strip leading zeros or something? *)
+  (* todo: need to strip leading zeros or something? *)
+  (* Z.to_bits is in little endian but we need it in big endian *)
   let z_to_bigendian_bits v =
     let s = Z.to_bits v in
     let len = String.length s in
@@ -240,9 +241,8 @@ module GNUNET_RsaPublicKey = struct
         { header; n; e })
     |+ field header_bin (fun t -> t.header)
     (* TODO
-         Z.to_bits is in little endian but we need it in big endian *)
-    (* TODO
-       here it should not be [cstring] but [bytes t.header.n_len] *)
+       here it should not be [cstring] but [bytes t.header.n_len]
+       -> just parse this without Bin *)
     |+ field cstring (fun t -> z_to_bigendian_bits t.n)
     |+ field cstring (fun t -> z_to_bigendian_bits t.e)
     |> sealr