Add caveat to readme.

README.md

@@ -1,13 +1,8 @@
 # GeoTools
 
-You have lots of plugin choices if you want to geocode North American addresses, or find all the locations near somewhere.  But few help you with forms and validation.
+## Caveat
 
-This plugin does four things:
-
-* Adds `latitude_field` and `longitude_field` form helpers to Rails' default form builder.
-* Lets your model acts_as_location, to work seamlessly with the form helpers.
-* Validates the location data entered on the form and in the database.
-* Gives you a `within` named scope to find all lcoations within a given bounding box, such as you would have on a Google map.
+This code is quite old.  I wouldn't do things this way now, but it's in production and it works.
 
 
 ## Compatibility
@@ -17,6 +12,18 @@ Works on Ruby 1.8+ and 1.9+.
 Designed for Rails 2.3.
 
 
+## Overview
+
+You have lots of plugin choices if you want to geocode North American addresses, or find all the locations near somewhere.  But few help you with forms and validation.
+
+This plugin does four things:
+
+* Adds `latitude_field` and `longitude_field` form helpers to Rails' default form builder.
+* Lets your model acts_as_location, to work seamlessly with the form helpers.
+* Validates the location data entered on the form and in the database.
+* Gives you a `within` named scope to find all lcoations within a given bounding box, such as you would have on a Google map.
+
+
 ## Assumptions
 
 * Any model that acts_as_location has integers defined for each component of the latitude and longitude: