diff --git a/db/migrate/20231115126452_add_journal_parent_id_index.rb b/db/migrate/20231115126452_add_journal_parent_id_index.rb
new file mode 100644
index 00000000..2ebca483
--- /dev/null
+++ b/db/migrate/20231115126452_add_journal_parent_id_index.rb
@@ -0,0 +1,5 @@
+class AddJournalParentIdIndex < ActiveRecord::Migration[5.2]
+  def change
+    add_index :journals, :parent_id
+  end
+end