From 2aab983fff209d5b696beb8d37564aeba9a6d7b3 Mon Sep 17 00:00:00 2001
From: "yuuji.yaginuma" <yuuji.yaginuma@gmail.com>
Date: Wed, 19 Oct 2016 17:00:33 +0900
Subject: update doc about `change_column_default` [ci skip]

Follow up to #20018.
---
 activerecord/lib/active_record/migration.rb | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'activerecord')

diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index 627e93b5b6..f333769159 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -278,8 +278,10 @@ module ActiveRecord
   #
   # * <tt>change_column(table_name, column_name, type, options)</tt>:  Changes
   #   the column to a different type using the same parameters as add_column.
-  # * <tt>change_column_default(table_name, column_name, default)</tt>: Sets a
-  #   default value for +column_name+ defined by +default+ on +table_name+.
+  # * <tt>change_column_default(table_name, column_name, default_or_changes)</tt>:
+  #   Sets a default value for +column_name+ defined by +default_or_changes+ on
+  #   +table_name+. Passing a hash containing <tt>:from</tt> and <tt>:to</tt>
+  #   as +default_or_changes+ will make this change reversible in the migration.
   # * <tt>change_column_null(table_name, column_name, null, default = nil)</tt>:
   #   Sets or removes a +NOT NULL+ constraint on +column_name+. The +null+ flag
   #   indicates whether the value can be +NULL+. See
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