diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb
index d0dde54015fed7ad1ddcd4436d94fb49758f8e8c..53a7ea7f117e7e32d7cd9f71f35b413a6d1871a2 100755
--- a/activerecord/lib/active_record/associations.rb
+++ b/activerecord/lib/active_record/associations.rb
@@ -150,7 +150,8 @@ def clear_association_cache #:nodoc:
     # in both conditions and orders. So :order => "posts.id DESC" will work while :order => "id DESC" will not. This may require that
     # you alter the :order and :conditions on the association definitions themselves.
     #
-    # It's currently not possible to use eager loading on multiple associations from the same table.
+    # It's currently not possible to use eager loading on multiple associations from the same table. Eager loading will also not pull
+    # additional attributes on join tables, so "rich associations" with has_and_belongs_to_many is not a good fit for eager loading.
     #
     # == Modules
     #