update patron duplicate checking

diff --git a/en/manual.xml b/en/manual.xml
index 01c1f6d..53a5708 100644 (file)
--- a/en/manual.xml
+++ b/en/manual.xml
@@ -22225,6 +22225,12 @@ location: [STAFF, ISO]</programlisting>Will block items with an itype code of
           </imageobject>
         </mediaobject>
       </screenshot>
+      <tip>
+        <para>A duplicate patron is detected if first and last names match and there is no date of
+          birth populated or if first name, last name and date of birth fields are all populated. If
+          two patrons have matching names, but one has a date of birth and the other does not they
+          will not match as duplicates.</para>
+      </tip>
 
       <para>If you have set a minimum or upper age limit on the patron
       category and are requiring that the birth date be filled in, Koha will