--- a/ckanext/ga_report/controller.py
+++ b/ckanext/ga_report/controller.py
@@ -22,6 +22,7 @@
 
 
 def _month_details(cls):
+    '''Returns a list of all the month names'''
     months = []
     vals = model.Session.query(cls.period_name).filter(cls.period_name!='All').distinct().all()
     for m in vals: