1 files changed, 3 insertions, 0 deletions

diff --git a/PROTOCOL.u2f b/PROTOCOL.u2f
index ca55c4297..4bd166bbb 100644
--- a/PROTOCOL.u2f
+++ b/PROTOCOL.u2f
@@ -58,12 +58,14 @@ the existing ecdsa-sha2-nistp* key types.
 The format of a sk-ecdsa-sha2-nistp256@openssh.com public key is:
 
         string          "sk-ecdsa-sha2-nistp256@openssh.com"
+        string          curve name
         ec_point        Q
         string          application (user-specified, but typically "ssh:")
 
 The corresponding private key contains:
 
         string          "sk-ecdsa-sha2-nistp256@openssh.com"
+        string          curve name
         ec_point        Q
         string          application (user-specified, but typically "ssh:")
         string          key_handle
@@ -75,6 +77,7 @@ information to the public key:
 
         string          "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com"
         string          nonce
+        string          curve name
         ec_point        Q
         string          application
         uint64          serial