diff --git a/circuits/cpp/barretenberg/cpp/src/barretenberg/crypto/ecdsa/ecdsa.hpp b/circuits/cpp/barretenberg/cpp/src/barretenberg/crypto/ecdsa/ecdsa.hpp
index 8264ed985f2..bc2a6dafe17 100644
--- a/circuits/cpp/barretenberg/cpp/src/barretenberg/crypto/ecdsa/ecdsa.hpp
+++ b/circuits/cpp/barretenberg/cpp/src/barretenberg/crypto/ecdsa/ecdsa.hpp
@@ -31,6 +31,7 @@ signature construct_signature(const std::string& message, const key_pair<Fr, G1>
 template <typename Hash, typename Fq, typename Fr, typename G1>
 typename G1::affine_element recover_public_key(const std::string& message, const signature& sig);
 
+// TODO(https://github.com/AztecProtocol/barretenberg/issues/659)
 template <typename Hash, typename Fq, typename Fr, typename G1>
 bool verify_signature(const auto& message,
                       const typename G1::affine_element& public_key,
diff --git a/circuits/cpp/barretenberg/cpp/src/barretenberg/crypto/schnorr/schnorr.tcc b/circuits/cpp/barretenberg/cpp/src/barretenberg/crypto/schnorr/schnorr.tcc
index b2fdd18ea30..b805de33204 100644
--- a/circuits/cpp/barretenberg/cpp/src/barretenberg/crypto/schnorr/schnorr.tcc
+++ b/circuits/cpp/barretenberg/cpp/src/barretenberg/crypto/schnorr/schnorr.tcc
@@ -24,7 +24,8 @@ namespace schnorr {
  *
  * @tparam Hash the hash-function used as random-oracle
  * @tparam G1 Group over which the signature is produced
- * @param message what are we signing over? // WORKTODO: this was only audited for std::string.
+ * @todo TODO(https://github.com/AztecProtocol/barretenberg/issues/659)
+ * @param message what are we signing over?
  * @param pubkey the pubkey of the signer
  * @param R the nonce
  * @return e = H(pedersen(R.x || pubkey.x || pubkey.y), message) as a 256-bit integer,