From 416e8049bc913cdcf1b84a90eeb5437ce5ac30e4 Mon Sep 17 00:00:00 2001
From: Jared Beck <jared@jaredbeck.com>
Date: Thu, 23 Jul 2015 15:15:58 -0400
Subject: [PATCH] Docs: Update options for add_reference

[ci skip]
---
 .../connection_adapters/abstract/schema_statements.rb         | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
index a30945d0ee..09ac083069 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
@@ -665,9 +665,11 @@ module ActiveRecord
       # [<tt>:index</tt>]
       #   Add an appropriate index. Defaults to false.
       # [<tt>:foreign_key</tt>]
-      #   Add an appropriate foreign key. Defaults to false.
+      #   Add an appropriate foreign key constraint. Defaults to false.
       # [<tt>:polymorphic</tt>]
       #   Whether an additional +_type+ column should be added. Defaults to false.
+      # [<tt>:null</tt>]
+      #   Whether the column allows nulls. Defaults to true.
       #
       # ====== Create a user_id integer column
       #