--- a/xml/en/docs/http/ngx_http_upstream_module.xml	Wed May 27 08:10:09 2015 +0000
+++ b/xml/en/docs/http/ngx_http_upstream_module.xml	Wed May 27 18:06:02 2015 +0300
@@ -10,7 +10,7 @@
 <module name="Module ngx_http_upstream_module"
         link="/en/docs/http/ngx_http_upstream_module.html"
         lang="en"
-        rev="38">
+        rev="39">
 
 <section id="summary">
 
@@ -283,7 +283,7 @@
 
 
 <directive name="zone">
-<syntax><value>name</value> <value>size</value></syntax>
+<syntax><value>name</value> [<value>size</value>]</syntax>
 <default/>
 <context>upstream</context>
 <appeared-in>1.9.0</appeared-in>
@@ -292,6 +292,8 @@
 Defines the <value>name</value> and <value>size</value> of the shared
 memory zone that keeps the group’s configuration and run-time state that are
 shared between worker processes.
+Several groups may share the same zone.
+In this case, it is enough to specify the <value>size</value> only once.
 </para>
 
 <para>