Added some comments/docs to Crop.create_from_csv

app/models/crop.rb

@@ -99,6 +99,14 @@ class Crop < ActiveRecord::Base
     return interesting_crops
   end
 
+# Crop.create_from_csv(row)
+# used by db/seeds.rb and rake growstuff:import_crops
+# CSV fields:
+# - system_name (required)
+# - scientific name (optional, can be picked up from parent if it has one)
+# - en_wikipedia_url (required)
+# - parent (system name, optional)
+
   def Crop.create_from_csv(row)
     system_name,scientific_name,en_wikipedia_url,parent = row