diff --git a/auto-update/Control/AutoUpdate/Event.hs b/auto-update/Control/AutoUpdate/Event.hs
index 8f700d08c..e2a5e29cd 100644
--- a/auto-update/Control/AutoUpdate/Event.hs
+++ b/auto-update/Control/AutoUpdate/Event.hs
@@ -4,6 +4,11 @@ module Control.AutoUpdate.Event (
     -- * Creation
     mkAutoUpdate,
     mkAutoUpdateWithModify,
+
+    -- * Internal
+    UpdateState (..),
+    mkClosableAutoUpdate,
+    mkClosableAutoUpdate',
 )
 where
 
@@ -12,9 +17,10 @@ import Control.Monad
 import Data.IORef
 import GHC.Event (getSystemTimerManager, registerTimeout, unregisterTimeout)
 
-import Control.AutoUpdate.Internal
 import Control.AutoUpdate.Types
 
+--------------------------------------------------------------------------------
+
 -- | Generate an action which will either read from an automatically
 -- updated value, or run the update action in the current thread.
 --
@@ -30,6 +36,21 @@ mkAutoUpdate = mkAutoUpdateThings $ \g _ _ -> g
 mkAutoUpdateWithModify :: UpdateSettings a -> (a -> IO a) -> IO (IO a)
 mkAutoUpdateWithModify us f = mkAutoUpdateThingsWithModify (\g _ _ -> g) us f
 
+--------------------------------------------------------------------------------
+
+{- FOURMOLU_DISABLE -}
+data UpdateState a =
+    UpdateState
+    { usUpdateAction_   :: a -> IO a
+    , usLastResult_     :: IORef a
+    , usIntervalMicro_  :: Int
+    , usTimeHasCome_    :: TVar Bool
+    , usDeleteTimeout_  :: IORef (IO ())
+    }
+{- FOURMOLU_ENABLE -}
+
+--------------------------------------------------------------------------------
+
 mkAutoUpdateThings
     :: (IO a -> IO () -> UpdateState a -> b) -> UpdateSettings a -> IO b
 mkAutoUpdateThings mk settings@UpdateSettings{..} =
@@ -43,6 +64,30 @@ mkAutoUpdateThingsWithModify mk settings update1 = do
 
 --------------------------------------------------------------------------------
 
+-- $setup
+-- >>> :set -XNumericUnderscores
+-- >>> import Control.Concurrent
+
+-- |
+-- >>> iref <- newIORef (0 :: Int)
+-- >>> action = modifyIORef iref (+ 1) >> readIORef iref
+-- >>> (getValue, closeState) <- mkClosableAutoUpdate $ defaultUpdateSettings { updateFreq = 200_000, updateAction = action }
+-- >>> getValue
+-- 1
+-- >>> threadDelay 100_000 >> getValue
+-- 1
+-- >>> threadDelay 200_000 >> getValue
+-- 2
+-- >>> closeState
+mkClosableAutoUpdate :: UpdateSettings a -> IO (IO a, IO ())
+mkClosableAutoUpdate = mkAutoUpdateThings $ \g c _ -> (g, c)
+
+-- | provide `UpdateState` for debugging
+mkClosableAutoUpdate' :: UpdateSettings a -> IO (IO a, IO (), UpdateState a)
+mkClosableAutoUpdate' = mkAutoUpdateThings (,,)
+
+--------------------------------------------------------------------------------
+
 mkDeleteTimeout :: TVar Bool -> Int -> IO (IO ())
 mkDeleteTimeout thc micro = do
     mgr <- getSystemTimerManager
diff --git a/auto-update/Control/AutoUpdate/Internal.hs b/auto-update/Control/AutoUpdate/Internal.hs
index e6dadafc0..bbda5c957 100644
--- a/auto-update/Control/AutoUpdate/Internal.hs
+++ b/auto-update/Control/AutoUpdate/Internal.hs
@@ -2,96 +2,10 @@
 
 module Control.AutoUpdate.Internal (
     -- * Debugging
+    UpdateState (..),
     mkClosableAutoUpdate,
     mkClosableAutoUpdate',
-    UpdateState (..),
 )
 where
 
-import Control.Concurrent.STM
-import Control.Monad
-import Data.IORef
-import GHC.Event (getSystemTimerManager, registerTimeout, unregisterTimeout)
-
-import Control.AutoUpdate.Types
-
--- $setup
--- >>> :set -XNumericUnderscores
--- >>> import Control.Concurrent
-
--- |
--- >>> iref <- newIORef (0 :: Int)
--- >>> action = modifyIORef iref (+ 1) >> readIORef iref
--- >>> (getValue, closeState) <- mkClosableAutoUpdate $ defaultUpdateSettings { updateFreq = 200_000, updateAction = action }
--- >>> getValue
--- 1
--- >>> threadDelay 100_000 >> getValue
--- 1
--- >>> threadDelay 200_000 >> getValue
--- 2
--- >>> closeState
-mkClosableAutoUpdate :: UpdateSettings a -> IO (IO a, IO ())
-mkClosableAutoUpdate = mkAutoUpdateThings $ \g c _ -> (g, c)
-
--- | provide `UpdateState` for debugging
-mkClosableAutoUpdate' :: UpdateSettings a -> IO (IO a, IO (), UpdateState a)
-mkClosableAutoUpdate' = mkAutoUpdateThings (,,)
-
-mkAutoUpdateThings
-    :: (IO a -> IO () -> UpdateState a -> b) -> UpdateSettings a -> IO b
-mkAutoUpdateThings mk settings@UpdateSettings{..} =
-    mkAutoUpdateThingsWithModify mk settings (const updateAction)
-
-mkAutoUpdateThingsWithModify
-    :: (IO a -> IO () -> UpdateState a -> b) -> UpdateSettings a -> (a -> IO a) -> IO b
-mkAutoUpdateThingsWithModify mk settings update1 = do
-    us <- openUpdateState settings update1
-    pure $ mk (getUpdateResult us) (closeUpdateState us) us
-
---------------------------------------------------------------------------------
-
-{- FOURMOLU_DISABLE -}
-data UpdateState a =
-    UpdateState
-    { usUpdateAction_   :: a -> IO a
-    , usLastResult_     :: IORef a
-    , usIntervalMicro_  :: Int
-    , usTimeHasCome_    :: TVar Bool
-    , usDeleteTimeout_  :: IORef (IO ())
-    }
-{- FOURMOLU_ENABLE -}
-
-mkDeleteTimeout :: TVar Bool -> Int -> IO (IO ())
-mkDeleteTimeout thc micro = do
-    mgr <- getSystemTimerManager
-    key <- registerTimeout mgr micro (atomically $ writeTVar thc True)
-    pure $ unregisterTimeout mgr key
-
-openUpdateState :: UpdateSettings a -> (a -> IO a) -> IO (UpdateState a)
-openUpdateState UpdateSettings{..} update1 = do
-    thc <- newTVarIO False
-    UpdateState update1
-        <$> (newIORef =<< updateAction)
-        <*> pure updateFreq
-        <*> pure thc
-        <*> (newIORef =<< mkDeleteTimeout thc updateFreq)
-
-closeUpdateState :: UpdateState a -> IO ()
-closeUpdateState UpdateState{..} = do
-    delete <- readIORef usDeleteTimeout_
-    delete
-
-onceOnTimeHasCome :: UpdateState a -> IO () -> IO ()
-onceOnTimeHasCome UpdateState{..} action = do
-    action' <- atomically $ do
-        timeHasCome <- readTVar usTimeHasCome_
-        when timeHasCome $ writeTVar usTimeHasCome_ False
-        pure $ when timeHasCome action
-    action'
-
-getUpdateResult :: UpdateState a -> IO a
-getUpdateResult us@UpdateState{..} = do
-    onceOnTimeHasCome us $ do
-        writeIORef usLastResult_ =<< usUpdateAction_ =<< readIORef usLastResult_
-        writeIORef usDeleteTimeout_ =<< mkDeleteTimeout usTimeHasCome_ usIntervalMicro_
-    readIORef usLastResult_
+import Control.AutoUpdate.Event