diff --git a/0pdd.rb b/0pdd.rb
index e5725df4..fc34a3f7 100644
--- a/0pdd.rb
+++ b/0pdd.rb
@@ -149,6 +149,8 @@
   end
 end
 use Rack::Deflater
+# @todo #572 rewind is removed from rack 3.0, so it is moved to
+#  rewindableInput for now, but it is better to check another solutions
 use Rack::RewindableInput::Middleware
 
 before '/*' do