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diff --git a/doc/pazpar2_protocol.xml b/doc/pazpar2_protocol.xml
index 924c6e7..009635b 100644
--- a/doc/pazpar2_protocol.xml
+++ b/doc/pazpar2_protocol.xml
@@ -177,7 +177,36 @@
filter
- Filtering.
+ Limits the search to a given set of targets specified by the
+ filter. The filter consists a comma separated list of
+ setting+operator+args pairs. The setting is a Pazpar2 setting
+ (such as pz:id).
+ The operator is either = (string match)
+ or ~ (substring match). The args is a list of values separated
+ by | (or , one of the values). The idea is that only targets
+ with a setting matching one of the values given will be included
+ in the search.
+
+
+
+
+ startrecs
+
+
+ Specifies the first record to retrieve from each target.
+ The first record in a result set for a target is numbered 0, next
+ record is numbered 2. By default maxrecs is 0.
+
+
+
+
+ maxrecs
+
+
+ Specifies the maximum number of records to retrieve from each
+ target. The default value is 100. This setting has same meaning
+ as per-target setting pz:maxrecs . If pz:maxrecs is set, it takes
+ precedence over argument maxrecs.