Merge pull request #2419 from DemocracyClub/pmk01-patch-15

Field definitions

ynr/apps/data_exports/templates/data_exports/data_home.html

@@ -10,6 +10,11 @@
         and are happy to answer any questions you might have. <a href="https://democracyclub.org.uk/contact/">
             Please get in touch</a>!</p>
     <p>Please note this data is currently updated every minute.</p>
+
+<p>All date formats must be yyyy-mm-dd. An explanation of our election ID system can be found <a href="https://elections.democracyclub.org.uk/election_types/"> here</a>. 
+    The parties field accepts party ID numbers as assigned by the Electoral Commission.</p>
+
+
     <form action="" method="get">
 
         <aside class="ds-filter">