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diff --git a/app/Main.hs b/app/Main.hs
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+{-# LANGUAGE BlockArguments #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# OPTIONS_GHC -fno-warn-name-shadowing #-}
+
+module Main where
+
+import Conduit
+import Data.Maybe
+import Data.XML.Types
+import Network.HTTP.Conduit
+import Text.Atom.Conduit.Parse
+import Text.Atom.Conduit.Render
+import Text.XML.Stream.Parse
+import Text.XML.Stream.Render
+import Text.XML.Unresolved (elementToEvents)
+
+main :: IO ()
+main = do
+  request <- parseRequest "https://code.nomath.org/abuilder/atom"
+  manager <- newManager tlsManagerSettings
+  runResourceT do
+    response <- http request manager
+    runConduit $
+      ( \feed ->
+          renderAtomFeed feed
+            .| renderBytes def
+            .| printC
+      )
+        . fromJust
+        =<< responseBody response
+          .| parseBytes def
+          .| massage
+          .| atomFeed
+
+massage :: ConduitT Event Event (ResourceT IO) ()
+massage = do
+  await >>= \case
+    Nothing -> pure ()
+    Just e -> do
+      yield e -- BeginDocument
+      await >>= \case
+        Nothing -> pure ()
+        Just e -> do
+          yield e -- <feed>
+          yieldMany (elementToEvents idE)
+          yieldMany (elementToEvents updatedE)
+  mapC id
+  where
+    idE =
+      -- TODO(id)
+      Element
+        "{http://www.w3.org/2005/Atom}id"
+        []
+        [ NodeContent (ContentText "TODO")
+        ]
+    updatedE =
+      -- TODO(updated)
+      Element
+        "{http://www.w3.org/2005/Atom}updated"
+        []
+        [ NodeContent (ContentText "1970-01-01T00:00:00Z")
+        ]