Document how to customize for an ISP

README.md

@@ -91,6 +91,21 @@ At this point, Django should run correctly:
     python manage.py runserver
 
 
+ISP-specific configuration
+==========================
+
+The main place to customize Coin for your ISP is the IspDatabase application,
+in the admin.  Information entered in this application has two purposes:
+
+1) generate a JSON file usable by http://db.ffdn.org/
+
+2) customize the user interface (postal address, bank account, ISP name & logo...)
+
+
+Some bits of configuration are done in `settings.py`: LDAP branches, RSS feeds
+to display on the home page, and so on.
+
+
 More information
 ================