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diff --git a/doc/pazpar2_conf.xml b/doc/pazpar2_conf.xml
index f41070c..8aac27a 100644
--- a/doc/pazpar2_conf.xml
+++ b/doc/pazpar2_conf.xml
@@ -1145,7 +1145,7 @@
      <listitem>
       <para>
        Allows you to specify an arbitrary PQF query language substring.
-       The provided string is prefixed the user's query after it has been
+       The provided string is prefixed to the user's query after it has been
        normalized to PQF internally in pazpar2.
        This allows you to attach complex 'filters' to queries for a given
        target, sometimes necessary to select sub-catalogs
@@ -1168,6 +1168,17 @@
        <literal>@and @attr 1=30 @attr 2=3 %Y %%</literal>
        would search for current year combined with the original PQF (%%).
       </para>
+      <para>
+       This setting can also be used as more general alternative to
+       pz:pqf_prefix -- a way of embedding the submitted query
+       anywhere in the string rather than appending it to prefix.  For
+       example, if it is desired to omit all records satisfying the
+       query <literal>@attr 1=pica.bib 0007</literal> then this
+       subquery can be combined with the submitted query as the second
+       argument of <literal>@andnot</literal> by using the
+       pz:pqf_strftime value <literal>@not %% @attr 1=pica.bib
+       0007</literal>.
+      </para>
      </listitem>
     </varlistentry>
     
@@ -1253,7 +1264,9 @@
        an existing CCL field, a raw PQF string or a local limit. Leading string
        determines type; either <literal>ccl:</literal> for CCL field, 
        <literal>rpn:</literal> for PQF/RPN, or <literal>local:</literal>
-       for filtering in Pazpar2.
+       for filtering in Pazpar2. The local filtering may be followed
+       by a field a metadata field (default is to use the name of the 
+       limitmap itself).
       </para>
       <note>
        <para>