Document known issue with :includes option.

README.rdoc

@@ -139,6 +139,16 @@ There are few options for finding objects near a given point in SQLite without i
 Because Geocoder needs to provide this functionality as a scope, we must go with option #1, but feel free to implement #2 or #3 if you need more accuracy.
 
 
+== Known Issue
+
+You cannot use the +near+ scope with another scope that provides an +includes+ option because the +SELECT+ clause generated by +near+ will overwrite it (or vice versa). Instead, try using +joins+ and pass a <tt>:select</tt> option to the +near+ scope to get the columns you want. For example, in Rails 2 syntax:
+
+  # instead of a simple :includes => :venues:
+  City.near("Omaha, NE", 20, :select => "venues.*").all(:joins => :venues)
+
+If anyone has a more elegant solution to this problem I am very interested in seeing it.
+
+
 == To-do List
 
 * prevent NameError when GOOGLE_MAPS_API_KEY is missing: show nice msg