Document IrreversibleMigration.

rails · Sep 1, 2009 · acd5395 · acd5395
1 parent bae00bb
commit acd5395
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
@@ -1,7 +1,8 @@
 require 'active_support/core_ext/object/metaclass'
 
 module ActiveRecord
-  class IrreversibleMigration < ActiveRecordError#:nodoc:
+  # Exception that can be raised to stop migrations from going backwards.
+  class IrreversibleMigration < ActiveRecordError
   end
 
   class DuplicateMigrationVersionError < ActiveRecordError#:nodoc: