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diff --git a/doc/pazpar2_protocol.xml b/doc/pazpar2_protocol.xml
index 006aab1..7b30ca8 100644
--- a/doc/pazpar2_protocol.xml
+++ b/doc/pazpar2_protocol.xml
@@ -9,7 +9,6 @@
      <!ENTITY % idcommon SYSTEM "common/common.ent">
      %idcommon;
 ]>
-<!-- $Id: pazpar2_protocol.xml,v 1.16 2007-10-08 13:19:22 adam Exp $ -->
 <refentry id="pazpar2_protocol">
  <refentryinfo>
   <productname>Pazpar2</productname>
@@ -281,7 +280,8 @@ search.pz2?session=2044502273&command=stat
 	field first. A sort field may be followed by a colon followed by
 	the number '0' or '1', indicating whether results should be sorted in
 	increasing or decreasing order according to that field. 0==Decreasing is
-	the default.
+	the default. Sort field names can be any field name designated as a sort field
+        in the pazpar2.cfg file, or the special name 'relevance'.
        </para>
       </listitem>
      </varlistentry>