Updated readme [skip ci]

README.md

@@ -848,12 +848,18 @@ config.active_record.dump_schema_after_migration = `git status db/migrate/ --por
 
 ## Schema Sanity
 
-Columns can flip order in `db/schema.rb` when you have multiple developers. One way to prevent this is to [alphabetize them](https://www.pgrs.net/2008/03/12/alphabetize-schema-rb-columns/). Add to the end of your `Rakefile`:
+Columns and extensions can flip order in `db/schema.rb` when you have multiple developers. One way to prevent this is to [alphabetize them](https://www.pgrs.net/2008/03/12/alphabetize-schema-rb-columns/). Add to the end of your `Rakefile`:
 
 ```ruby
 task "db:schema:dump": "strong_migrations:alphabetize_columns"
 ```
 
+or add to `config/initializers/strong_migrations.rb`: [unreleased]
+
+```ruby
+StrongMigrations.alphabetize_schema = true
+```
+
 ## Permissions
 
 We recommend using a [separate database user](https://ankane.org/postgres-users) for migrations when possible so you don’t need to grant your app user permission to alter tables.