diff --git a/guides/source/active_record_postgresql.md b/guides/source/active_record_postgresql.md
index 5eb19f52147062c1647193786aa13c949a19ae11..dee64e6439cbea4a00b711dcdc241d6251ce1584 100644
--- a/guides/source/active_record_postgresql.md
+++ b/guides/source/active_record_postgresql.md
@@ -435,7 +435,7 @@ create_table :documents do |t|
   t.string 'body'
 end
 
-execute "CREATE INDEX documents_idx ON documents USING gin(to_tsvector('english', title || ' ' || body));"
+add_index :documents, "to_tsvector('english', title || ' ' || body)", using: :gin, name: 'documents_idx'
 
 # app/models/document.rb
 class Document < ApplicationRecord