diff --git a/doc/development/migration_style_guide.md b/doc/development/migration_style_guide.md
index 513659d0f6889e20f4a1fb94a2480fbf982553da..33f51c20446f80b9aeeaaca964b5e65f609175cc 100644
--- a/doc/development/migration_style_guide.md
+++ b/doc/development/migration_style_guide.md
@@ -973,6 +973,8 @@ Under the hood, it works like this:
 
 ```ruby
 class SwapPrimaryKey < Gitlab::Database::Migration[2.1]
+  disable_ddl_transaction!
+
   TABLE_NAME = :table_name
   PRIMARY_KEY = :table_name_pkey
   OLD_INDEX_NAME = :old_index_name