Added mention of 'relevance' sortfield

diff --git a/doc/pazpar2_protocol.xml b/doc/pazpar2_protocol.xml
index 0a40fcd..7b30ca8 100644 (file)
--- a/doc/pazpar2_protocol.xml
+++ b/doc/pazpar2_protocol.xml
@@ -280,7 +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>