diff --git a/constant/version.go b/constant/version.go
index 20bee753..d6bfcd9c 100644
--- a/constant/version.go
+++ b/constant/version.go
@@ -1,3 +1,3 @@
 package constant
 
-var Version = "1.1-beta16"
+var Version = "1.1-beta17"
diff --git a/docs/changelog.md b/docs/changelog.md
index 1583a41e..3e4a9893 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,3 +1,11 @@
+#### 1.1-beta17
+
+* Fix shadowtls server **1**
+
+*1*:
+
+Added [fallback_after](/configuration/inbound/shadowtls#fallback_after) options.
+
 #### 1.0.7
 
 * Add support for new x/h2 deadline
diff --git a/docs/configuration/inbound/shadowtls.md b/docs/configuration/inbound/shadowtls.md
index 372272d9..1c2e8fb6 100644
--- a/docs/configuration/inbound/shadowtls.md
+++ b/docs/configuration/inbound/shadowtls.md
@@ -9,6 +9,7 @@
 
   "version": 2,
   "password": "fuck me till the daylight",
+  "fallback_after": 2,
   "handshake": {
     "server": "google.com",
     "server_port": 443,
@@ -39,6 +40,15 @@ Set password.
 
 Only available in the ShadowTLS v2 protocol.
 
+
+#### fallback_after
+
+Packet count before perform fallback.
+
+Default is 2.
+
+Lowering this may prevent TLS 1.3 connections, but reduces the risk of being actively probed.
+
 #### handshake
 
 ==Required==
diff --git a/docs/configuration/inbound/shadowtls.zh.md b/docs/configuration/inbound/shadowtls.zh.md
index 0d549916..a2cd67ef 100644
--- a/docs/configuration/inbound/shadowtls.zh.md
+++ b/docs/configuration/inbound/shadowtls.zh.md
@@ -9,6 +9,7 @@
 
   "version": 2,
   "password": "fuck me till the daylight",
+  "fallback_after": 2,
   "handshake": {
     "server": "google.com",
     "server_port": 443,
@@ -39,6 +40,14 @@ ShadowTLS 协议版本。
 
 仅在 ShadowTLS v2 协议中可用。
 
+#### fallback_after
+
+在执行回退之前的包计数。
+
+默认值为 2。
+
+降低此值可能会阻止 TLS 1.3 连接，但会降低被主动探测的风险。
+
 #### handshake
 
 ==必填==