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-rw-r--r--activerecord/lib/active_record/migration.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index 5402cf2446..b132b3d820 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -66,7 +66,8 @@ module ActiveRecord
# named +column_name+ specified to be one of the following types:
# :string, :text, :integer, :float, :decimal, :datetime, :timestamp, :time,
# :date, :binary, :boolean. A default value can be specified by passing an
- # +options+ hash like { :default => 11 }.
+ # +options+ hash like { :default => 11 }. Other options include :limit and :null (e.g. { :limit => 50, :null => false })
+ # -- see ActiveRecord::ConnectionAdapters::TableDefinition#column for details.
# * <tt>rename_column(table_name, column_name, new_column_name)</tt>: Renames a column but keeps the type and content.
# * <tt>change_column(table_name, column_name, type, options)</tt>: Changes the column to a different type using the same
# parameters as add_column.