--- a/xml/en/docs/http/ngx_http_proxy_module.xml	Mon Sep 26 20:54:23 2016 +0300
+++ b/xml/en/docs/http/ngx_http_proxy_module.xml	Mon Jul 04 14:29:09 2016 +0300
@@ -10,7 +10,7 @@
 <module name="Module ngx_http_proxy_module"
         link="/en/docs/http/ngx_http_proxy_module.html"
         lang="en"
-        rev="48">
+        rev="49">
 
 <section id="summary">
 
@@ -374,7 +374,8 @@
 The file name in a cache is a result of
 applying the MD5 function to the
 <link id="proxy_cache_key">cache key</link>.
-The <literal>levels</literal> parameter defines hierarchy levels of a cache.
+The <literal>levels</literal> parameter defines hierarchy levels of a cache:
+from 1 to 3, each level accepts values 1 or 2.
 For example, in the following configuration
 <example>
 proxy_cache_path /data/nginx/cache levels=1:2 keys_zone=one:10m;