diff --git a/README.md b/README.md
index e07fdb9c..748ab87b 100644
--- a/README.md
+++ b/README.md
@@ -74,7 +74,7 @@ GmSSL是一个开源的密码工具箱，支持SM2/SM3/SM4/SM9等国密(国家
    可以将公钥从`signkey.pem`中导出并发发布给验证签名的一方
 
    ```sh
-   $ gmssl pkey -in signkey.pem -out vrfykey.pem
+   $ gmssl pkey -pubout -in signkey.pem -out vrfykey.pem
    $ gmssl pkeyutl -verify -pkeyopt ec_sign_algor:sm2 -inkey vrfykey.pem \
                    -in <yourfile> -sigfile <yourfile>.sig
    ```