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-rw-r--r--activerecord/lib/active_record/schema_migration.rb6
1 files changed, 5 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/schema_migration.rb b/activerecord/lib/active_record/schema_migration.rb
index cb47bf23f7..b384529e75 100644
--- a/activerecord/lib/active_record/schema_migration.rb
+++ b/activerecord/lib/active_record/schema_migration.rb
@@ -2,7 +2,11 @@ require 'active_record/scoping/default'
require 'active_record/scoping/named'
module ActiveRecord
- class SchemaMigration < ActiveRecord::Base
+ # This class is used to create a table that keeps track of which migrations
+ # have been applied to a given database. When a migration is run, its schema
+ # number is inserted in to the `SchemaMigration.table_name` so it doesn't need
+ # to be executed the next time.
+ class SchemaMigration < ActiveRecord::Base # :nodoc:
class << self
def primary_key
nil