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-rw-r--r--guides/source/rails_on_rack.md1
1 files changed, 1 insertions, 0 deletions
diff --git a/guides/source/rails_on_rack.md b/guides/source/rails_on_rack.md
index aa1476ecc0..8caddc785a 100644
--- a/guides/source/rails_on_rack.md
+++ b/guides/source/rails_on_rack.md
@@ -122,6 +122,7 @@ use ActiveRecord::Migration::CheckPending
use ActionDispatch::Cookies
use ActionDispatch::Session::CookieStore
use ActionDispatch::Flash
+use ActionDispatch::ContentSecurityPolicy::Middleware
use Rack::Head
use Rack::ConditionalGet
use Rack::ETag