--- a/README.rst
+++ b/README.rst
@@ -84,6 +84,15 @@
 
     $ paster loadanalytics token.dat latest --config=../ckan/development.ini
 
+The value after the token file is how much data you want to retrieve, this can be
+
+* **all**         - data for all time (since 2010)
+
+* **latest**      - (default) just the 'latest' data
+
+* **YYYY-MM-DD**  - just data for all time periods going back to (and including) this date
+
+
 
 Software Licence
 ================