--- 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="11">
+        rev="12">
 
 <section id="summary">
 
@@ -302,8 +302,8 @@ For example:
 <example>
 resolver 127.0.0.1 [::1]:5353;
 </example>
-An address can be specified as a domain name or IP address,
-and an optional port (1.3.1, 1.2.2).
+The address can be specified as a domain name or IP address,
+with an optional port (1.3.1, 1.2.2).
 If port is not specified, the port 53 is used.
 Name servers are queried in a round-robin fashion.
 <note>
@@ -311,6 +311,9 @@ Before version 1.1.7, only a single name
 Specifying name servers using IPv6 addresses is supported
 starting from versions 1.3.1 and 1.2.2.
 </note>
+</para>
+
+<para id="resolver_valid">
 By default, nginx caches answers using the TTL value of a response.
 An optional <literal>valid</literal> parameter allows overriding it:
 <example>
@@ -332,7 +335,7 @@ The parameter is available as part of ou
 <commercial_version>commercial subscription</commercial_version>.
 </para>
 
-<para>
+<para id="resolver_off">
 The special value <literal>off</literal> disables resolving.
 </para>