diff --git a/backend/db/migrate/20261112000000_add_foreign_key_on_deerjikists_tag_id.rb b/backend/db/migrate/20261112000000_add_foreign_key_on_deerjikists_tag_id.rb
new file mode 100644
index 0000000..94ade8c
--- /dev/null
+++ b/backend/db/migrate/20261112000000_add_foreign_key_on_deerjikists_tag_id.rb
@@ -0,0 +1,5 @@
+class AddForeignKeyOnDeerjikistsTagId < ActiveRecord::Migration[8.0]
+  def change
+    add_foreign_key :deerjikists, :tags, column: :tag_id
+  end
+end