diff --git a/reference/ldap/book.xml b/reference/ldap/book.xml
index 17210bcae3..ab66b8e830 100644
--- a/reference/ldap/book.xml
+++ b/reference/ldap/book.xml
@@ -77,6 +77,11 @@
      <link xlink:href="&url.ldap.openldap;">OpenLDAP Project</link>
     </para>
    </listitem>
+   <listitem>
+    <para>
+     Internet Engineering Taskforce RFCs <link xlink:href="&url.ietf.rfc;rfc4510">4510</link> through <link xlink:href="&url.ietf.rfc;rfc4519">4519</link>.
+    </para>
+   </listitem>
   </itemizedlist>
 
   <para>    
diff --git a/reference/ldap/functions/ldap-search.xml b/reference/ldap/functions/ldap-search.xml
index ae8d372292..83b6a2a7ac 100644
--- a/reference/ldap/functions/ldap-search.xml
+++ b/reference/ldap/functions/ldap-search.xml
@@ -68,7 +68,8 @@
       <para>
        The search filter can be simple or advanced, using boolean operators in
        the format described in the LDAP documentation (see the <link
-       xlink:href="&url.ldap.filters;">Netscape Directory SDK</link> for full
+       xlink:href="&url.ldap.filters;">Netscape Directory SDK</link> or
+       <link xlink:href="&url.ietf.rfc;rfc4515">RFC4515</link> for full
        information on filters).
       </para>
      </listitem>