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diff --git a/doc/pazpar2_protocol.xml b/doc/pazpar2_protocol.xml
index b74e42b..1de2ec2 100644
--- a/doc/pazpar2_protocol.xml
+++ b/doc/pazpar2_protocol.xml
@@ -197,9 +197,12 @@
       <term>limit</term>
       <listitem>
        <para>
-	Narrows the search by one or more facet fields. The limit is
-	sequence of one or more field=value pairs separate by comma.
+	Narrows the search by one or more fields (typicall facets).
+	The limit is sequence of one or more field=value pairs separate
+	by comma.
 	A value that contains a comma should be escaped by backslash (\).
+	The pz:fazetmap configuration item defines how the searches are 
+	mapped to a database.
        </para>
       </listitem>
      </varlistentry>