diff --git a/is-my-code-constant-time?.md b/is-my-code-constant-time?.md
index 4a1dc85..f1c564c 100644
--- a/is-my-code-constant-time?.md
+++ b/is-my-code-constant-time?.md
@@ -65,7 +65,11 @@ type Curve interface {
 	// the result is the all-zero value, ECDH returns an error.
 	ECDH(local *PrivateKey, remote *PublicKey) ([]byte, error)
 
-        SM2MQV(sLocal, eLocal *PrivateKey, sRemote, eRemote *PublicKey) (*PublicKey, error)
+	// SM2MQV performs a SM2 specific style ECMQV exchange and return the shared secret.
+	SM2MQV(sLocal, eLocal *PrivateKey, sRemote, eRemote *PublicKey) (*PublicKey, error)
+
+	// SM2SharedKey performs SM2 key derivation to generate shared keying data, the uv was generated by SM2MQV.
+	SM2SharedKey(isResponder bool, kenLen int, uv, sPub, sRemote *PublicKey, uid []byte, remoteUID []byte) ([]byte, error)
         
 	// GenerateKey generates a new PrivateKey from rand.
 	GenerateKey(rand io.Reader) (*PrivateKey, error)