--- a/xml/en/docs/mail/ngx_mail_core_module.xml
+++ b/xml/en/docs/mail/ngx_mail_core_module.xml
@@ -10,7 +10,7 @@
 <module name="Module ngx_mail_core_module"
         link="/en/docs/mail/ngx_mail_core_module.html"
         lang="en"
-        rev="21">
+        rev="22">
 
 <section id="summary">
 
@@ -314,8 +314,7 @@ parameters <literal>--without-mail_imap_
     <value>address</value> ...
     [<literal>valid</literal>=<value>time</value>]
     [<literal>ipv4</literal>=<literal>on</literal>|<literal>off</literal>]
-    [<literal>ipv6</literal>=<literal>on</literal>|<literal>off</literal>]
-    [<literal>status_zone</literal>=<value>zone</value>]</syntax>
+    [<literal>ipv6</literal>=<literal>on</literal>|<literal>off</literal>]</syntax>
 <syntax><literal>off</literal></syntax>
 <default>off</default>
 <context>mail</context>
@@ -370,16 +369,6 @@ configuring DNS servers in a properly se
 </note>
 </para>
 
-<para id="resolver_status_zone">
-The optional <literal>status_zone</literal> parameter (1.17.1)
-enables
-<link doc="../http/ngx_http_api_module.xml" id="resolvers_">collection</link>
-of DNS server statistics of requests and responses
-in the specified <value>zone</value>.
-The parameter is available as part of our
-<commercial_version>commercial subscription</commercial_version>.
-</para>
-
 <para id="resolver_off">
 The special value <literal>off</literal> disables resolving.
 </para>