diff --git a/db/migrate/20191219123145_add_index_to_repositories.rb b/db/migrate/20191219123145_add_index_to_repositories.rb
new file mode 100644
index 000000000..a7891d010
--- /dev/null
+++ b/db/migrate/20191219123145_add_index_to_repositories.rb
@@ -0,0 +1,5 @@
+class AddIndexToRepositories < ActiveRecord::Migration[5.2]
+  def change
+    add_index :repositories, :identifier
+  end
+end