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@@ -1,5 +1,7 @@
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 *SVN*
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+* Fixed that change_column should be able to use :null => true on a field that formerly had false [Nate Wiger] [#26]
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+
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 * Added that the MySQL adapter should map integer to either smallint, int, or bigint depending on the :limit just like PostgreSQL [DHH]
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 * Change validates_uniqueness_of :case_sensitive option default back to true (from [9160]).  Love your database columns, don't LOWER them.  [rick]

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@@ -297,7 +297,14 @@ module ActiveRecord
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       def add_column_options!(sql, options) #:nodoc:
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         sql << " DEFAULT #{quote(options[:default], options[:column])}" if options_include_default?(options)
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-        sql << " NOT NULL" if options[:null] == false
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+        # must explcitly check for :null to allow change_column to work on migrations
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+        if options.has_key? :null
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+          if options[:null] == false
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+            sql << " NOT NULL"
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+          else
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+            sql << " NULL"
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+          end
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+        end
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       end
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       # SELECT DISTINCT clause for a given set of columns and a given ORDER BY clause.