diff --git a/src/binary_formats.ml b/src/binary_formats.ml
index 6bd8a18e..f199ddcb 100644
--- a/src/binary_formats.ml
+++ b/src/binary_formats.ml
@@ -335,13 +335,7 @@ end
 (* EccSignaturePurpose *)
 module Purpose = struct
   type t = {
-    (* This field equals the number of bytes being signed,
-       namely 'sizeof (struct Data)'. *)
     size: int32;
-    (* This field is used to express the context in
-       which the signature is made, ensuring that a
-       signature cannot be lifted from one part of the protocol
-       to another. *)
     purpose: int32;
   }