diff --git a/README.md b/README.md
index a576fdde..b8d84f8d 100644
--- a/README.md
+++ b/README.md
@@ -380,6 +380,18 @@ Retrieves the OpenSSL `SSL*` object for the current HTTP request.
 
 On success, this function returns the pointer of type `SSL`. Otherwise `nil` and a string
 describing the error will be returned.
+resty.kong.tls.disable\_http2\_alpn
+----------------------------------------------------
+**syntax:** *ok, err = resty.kong.tls.disable\_http2\_alpn()*
+
+**context:** *client_hello_by_lua*
+
+**subsystems:** *http*
+
+Disables HTTP/2 ALPN negotiation for the current TLS connection. When called, the
+connection will not negotiate HTTP/2 using ALPN and will fallback to HTTP/1.1 even though [`http2`](https://nginx.org/en/docs/http/ngx_http_v2_module.html#http2) directive is enabled.
+
+This function returns `true` when the call is successful. Otherwise it returns `false` and a string describing the error.
 
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