diff --git a/pkg/mcclient/README.md b/pkg/mcclient/README.md
index 597bf438a1..c482cc69fc 100644
--- a/pkg/mcclient/README.md
+++ b/pkg/mcclient/README.md
@@ -2,42 +2,59 @@ Yunion OneCloud API go library
 ===============================
 
 
+Login to first controlplane node of your cluster and execute `ocadm cluster rcadmin` to get auth info.
+
+For example:
+
+```bash
+$ ocadm cluster rcadmin
+export OS_AUTH_URL=https://10.127.100.2:30500/v3
+export OS_USERNAME=sysadmin
+export OS_PASSWORD=7AQMP9H2umQvbxxx
+export OS_PROJECT_DOMAIN=default
+export OS_PROJECT_NAME=system
+export YUNION_INSECURE=true
+export OS_REGION_NAME=region0
+export OS_ENDPOINT_TYPE=publicURL
+```
+
 Sample code
 
-    :::golang
-    package main
+```golang 
+package main
 
-    import (
-        "context"
-        "fmt"
+import (
+	"context"
+	"fmt"
 
-        "yunion.io/x/onecloud/pkg/mcclient"
-        "yunion.io/x/onecloud/pkg/mcclient/modules"
-    )
+	"yunion.io/x/jsonutils"
 
-    func main() {
-        client := mcclient.NewClient("https://<onecloud_controller_ip>:30500/v3",
-            60,
-            true,
-            true,
-            "",
-            "")
-        token, err := client.Authenticate("sysadmin", "<password>", "Default", "system", "Default")
-        if err != nil {
-            panic(err)
-        }
-        s := client.NewSession(context.Background(),
-            "region0",
-            "",
-            "PublicURL",
-            token,
-            "")
-
-        result, err := modules.Servers.List(s, nil)
-        if err != nil {
-            panic(err)
-        }
-        fmt.Printf("%#v\n", result)
-    }
+	"yunion.io/x/onecloud/pkg/mcclient"
+	modules "yunion.io/x/onecloud/pkg/mcclient/modules/compute"
+)
 
+func main() {
+	client := mcclient.NewClient("https://10.127.100.2:30500/v3",
+		60,
+		true,
+		true,
+		"",
+		"")
+	token, err := client.Authenticate("sysadmin", "7AQMP9H2umQvbxxx", "Default", "system", "Default")
+	if err != nil {
+		panic(err)
+	}
+	s := client.NewSession(context.Background(),
+		"region0",
+		"",
+		"publicURL",
+		token,
+		"")
 
+	result, err := modules.Servers.List(s, nil)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("%s", jsonutils.Marshal(result).PrettyString())
+}
+```