diff --git a/docs/document/level-0/ch07-xray-server.md b/docs/document/level-0/ch07-xray-server.md
index a4eea54..4ddf3e7 100644
--- a/docs/document/level-0/ch07-xray-server.md
+++ b/docs/document/level-0/ch07-xray-server.md
@@ -279,7 +279,7 @@
             "network": "tcp",
             "security": "tls",
             "tlsSettings": {
-              "alpn": "http/1.1",
+              "alpn": ["h2", "http/1.1"],
               "certificates": [
                 {
                   "certificateFile": "/home/vpsadmin/xray_cert/xray.crt",