diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index 2024b225e4..4e00eb3d99 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -184,8 +184,8 @@ module ActiveRecord
   # you wish to downgrade. Alternatively, you can also use the STEP option if you
   # wish to rollback last few migrations. <tt>rake db:migrate STEP=2</tt> will rollback
   # the latest two migrations.
-  # 
-  # If any of the migrations throw an <tt>ActiveRecord::IrreversibleMigration</tt> exception, 
+  #
+  # If any of the migrations throw an <tt>ActiveRecord::IrreversibleMigration</tt> exception,
   # that step will fail and you'll have some manual work to do.
   #
   # == Database support