--- a/xml/en/docs/stream/ngx_stream_proxy_module.xml	Tue Oct 09 12:28:06 2018 +0300
+++ b/xml/en/docs/stream/ngx_stream_proxy_module.xml	Tue Oct 09 19:56:33 2018 +0300
@@ -9,7 +9,7 @@
 <module name="Module ngx_stream_proxy_module"
         link="/en/docs/stream/ngx_stream_proxy_module.html"
         lang="en"
-        rev="20">
+        rev="21">
 
 <section id="summary">
 
@@ -269,6 +269,24 @@
 </directive>
 
 
+<directive name="proxy_socket_keepalive">
+<syntax><literal>on</literal> | <literal>off</literal></syntax>
+<default>off</default>
+<context>stream</context>
+<context>server</context>
+<appeared-in>1.15.6</appeared-in>
+
+<para>
+Configures the “TCP keepalive” behavior
+for outgoing connections to a proxied server.
+By default, the operating system’s settings are in effect for the socket.
+If the directive is set to the value “<literal>on</literal>”, the
+<c-def>SO_KEEPALIVE</c-def> socket option is turned on for the socket.
+</para>
+
+</directive>
+
+
 <directive name="proxy_ssl">
 <syntax><literal>on</literal> | <literal>off</literal></syntax>
 <default>off</default>