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diff --git a/doc/pazpar2_conf.xml b/doc/pazpar2_conf.xml
index f91a4e0..1eb6fde 100644
--- a/doc/pazpar2_conf.xml
+++ b/doc/pazpar2_conf.xml
@@ -1055,10 +1055,11 @@
       <para>
        Specifies a filter which allows Pazpar2 to only include
        records that meet a certain criteria in a result. Unmatched records
-       will be ignored. The filter takes the form name[~value] , which
+       will be ignored. The filter takes the form name, name~value, or name=value, which
        will include only records with metadata element (name) that has the
-       substring (value) given. If value is omitted all records with the
-       metadata present will be included.
+       substring (~value) given, or matches exactly (=value). If value is omitted all records
+	with the named
+       metadata element present will be included.
       </para>
      </listitem>
     </varlistentry>