diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 6c71f631..bec05b48 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -19,6 +19,8 @@ require 'rspec/rails'
 # end with _spec.rb. You can configure this pattern with with the --pattern
 # option on the command line or in ~/.rspec, .rspec or `.rspec-local`.
 
+# Checks for pending migrations before tests are run.
+# If you are not using ActiveRecord, you can remove this line.
 ActiveRecord::Migration.maintain_test_schema!
 
 Dir[Rails.root.join("spec/support/**/*.rb")].each { |f| require f }