diff --git a/db/migrate/20170323130756_add_index_to_submissions.rb b/db/migrate/20170323130756_add_index_to_submissions.rb
new file mode 100644
index 00000000..185500d3
--- /dev/null
+++ b/db/migrate/20170323130756_add_index_to_submissions.rb
@@ -0,0 +1,6 @@
+class AddIndexToSubmissions < ActiveRecord::Migration
+  def change
+    add_index :submissions, :exercise_id
+    add_index :submissions, :user_id
+  end
+end