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diff --git a/doc/pazpar2_protocol.xml b/doc/pazpar2_protocol.xml
index e6763e2..f266fd7 100644
--- a/doc/pazpar2_protocol.xml
+++ b/doc/pazpar2_protocol.xml
@@ -240,6 +240,31 @@ search.pz?command=settings&session=2044502273&pz:allow[search.com:210/db1]=1
+
+ sort
+
+
+ Specifies sort criteria. The argument is a comma-separated list
+ (no whitespace allowed) of sort fields, with the highest-priority
+ field first. A sort field may be followed by a colon followed by
+ the number '0' (decreasing) or '1' (increasing). Default
+ sort order is decreasing.
+ Sort field names can be any field name designated as a sort field
+ in the pazpar2.cfg file, or the special names 'relevance' and
+ 'position'.
+
+
+ If not specified here or as sort-default"
+ in pazpar2.cfg, Pazpar2 will default to the built-in 'relevance' ranking.
+
+
+ Having sort criteria at search is important for targets that
+ supports native sorting in order to get best results. Pazpar2
+ will trigger a new search if search criteria changes from Pazpar2
+ to target-based sorting or visa-versa.
+
+
+
@@ -353,6 +378,15 @@ search.pz2?session=2044502273&command=stat
Sort field names can be any field name designated as a sort field
in the pazpar2.cfg file, or the special names 'relevance' and
'position'.
+
+ If not specified here or as sort-default"
+ in pazpar2.cfg, pazpar2 will default to the built-in 'relevance' ranking.
+
+ Having sort criteria at search is important for targets that
+ supports native sorting in order to get best results. pazpar2
+ will trigger a new search if search criteria changes from pazpar2
+ to target-based sorting.
+
For targets where If pz:sortmap