From 9f51eb24724df1e7c1bef004111ab4faca717378 Mon Sep 17 00:00:00 2001
From: Jeremy Kemper <jeremy@bitsweat.net>
Date: Wed, 23 May 2007 06:35:08 +0000
Subject: Fix :through docs wrecked up by [6777]. Closes #4961.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6817 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 activerecord/lib/active_record/associations.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb
index c72024d5f3..0e8a48f2a0 100755
--- a/activerecord/lib/active_record/associations.rb
+++ b/activerecord/lib/active_record/associations.rb
@@ -608,7 +608,8 @@ module ActiveRecord
       #   include the joined columns.
       # * <tt>:as</tt>: Specifies a polymorphic interface (See #belongs_to).
       # * <tt>:through</tt>: Specifies a Join Model to perform the query through.  Options for <tt>:class_name</tt> and <tt>:foreign_key</tt> 
-      #   are ignored, as the association uses the source reflection.
+      #   are ignored, as the association uses the source reflection. You can only use a <tt>:through</tt> query through a <tt>belongs_to</tt>
+      #   or <tt>has_many</tt> association on the join model.
       # * <tt>:source</tt>: Specifies the source association name used by <tt>has_many :through</tt> queries.  Only use it if the name cannot be 
       #   inferred from the association.  <tt>has_many :subscribers, :through => :subscriptions</tt> will look for either +:subscribers+ or
       #   +:subscriber+ on +Subscription+, unless a +:source+ is given.
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