--- a/xml/en/docs/http/ngx_http_upstream_module.xml
+++ b/xml/en/docs/http/ngx_http_upstream_module.xml
@@ -10,7 +10,7 @@
 <module name="Module ngx_http_upstream_module"
         link="/en/docs/http/ngx_http_upstream_module.html"
         lang="en"
-        rev="87">
+        rev="88">
 
 <section id="summary">
 
@@ -1027,6 +1027,13 @@ is passed to the server selected by the 
 Further requests with this cookie will be passed to the designated server.
 If the designated server cannot process a request, the new server is
 selected as if the client has not been bound yet.
+
+<note>
+As a load balancing method always tries to evenly distribute the load
+considering already bound requests,
+the server with a higher number of active bound requests
+has less possibility of getting new unbound requests.
+</note>
 </para>
 
 <para>