diff --git a/contracts/contracts/Sapphire.sol b/contracts/contracts/Sapphire.sol
index 7cd740f7..5f4c5ed0 100644
--- a/contracts/contracts/Sapphire.sol
+++ b/contracts/contracts/Sapphire.sol
@@ -344,8 +344,8 @@ library Sapphire {
      * @param alg The signing alg for which to generate a keypair.
      * @param seed The seed to use for generating the key pair. You can use the
      * `randomBytes` method if you don't already have a seed.
-     * @return publicKey The public half of the keypair.
-     * @return secretKey The secret half of the keypair.
+     * @return publicKey 32-byte or 33-byte (see above) public key.
+     * @return secretKey 32-byte secret key.
      */
     function generateSigningKeyPair(SigningAlg alg, bytes memory seed)
         internal